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Q, R's and some S's.

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Simon Forman 2022-03-28 18:39:42 -07:00
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docs/reference/mkref/FuncRef.html
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docs/reference/mkref/Functor-Reference.md
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@ -2807,121 +2807,109 @@ Or,
## quoted
Basis Function Combinator
Function
\[unit\] dip
"Quote D" Wrap the second item on the stack in a list.
Gentzen diagram.
a b quoted
----------------
[a] b
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[[unit]\] [dip]
### Discussion
Lorem ipsum.
This comes from the original Joy stuff.
### Crosslinks
Lorem ipsum.
[unit]
------------------------------------------------------------------------
## range
Basis Function Combinator
Function
\[0 \<=\] \[1 - dup\] anamorphism
Expect a number `n` on the stack and replace it with a list:
`[(n-1)...0]`.
Gentzen diagram.
### Example
5 range
-----------------
[4 3 2 1 0]
-5 range
--------------
[]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[0 \<=\] \[1 - [dup]\] [anamorphism]
### Discussion
Lorem ipsum.
If `n` is less than 1 the resulting list is empty.
### Crosslinks
Lorem ipsum.
[range_to_zero]
------------------------------------------------------------------------
## range_to_zero
Basis Function Combinator
Function
unit \[down_to_zero\] infra
Take a number `n` from the stack and replace it with a list
`[0...n]`.
Gentzen diagram.
### Example
5 range_to_zero
---------------------
[0 1 2 3 4 5]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> [unit] \[[down_to_zero]\] [infra]
### Discussion
Lorem ipsum.
Note that the order is reversed compared to [range].
### Crosslinks
Lorem ipsum.
[down_to_zero]
[range]
------------------------------------------------------------------------
## reco
Basis Function Combinator
Function
rest cons
Replace the first item in a list with the item under it.
Gentzen diagram.
a [b ...] reco
--------------------
[a ...]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [rest] [cons]
### Crosslinks
Lorem ipsum.
[codireco]
[make_generator]
--------------
@ -2941,159 +2929,93 @@ See [mod](#mod).
## remove
Basis Function Combinator
Function
Expects an item on the stack and a quote under it and removes that item
from the the quote. The item is only removed once. If the list is empty
or the item isn\'t in the list then the list is unchanged. :
or the item isn't in the list then the list is unchanged.
[1 2 3 1] 1 remove
[1 2 3 1] 1 remove
------------------------
[2 3 1]
Gentzen diagram.
[2 3 1]
### Definition
if not basis.
See the ["Remove Function" notebook](https://osdn.net/projects/joypy/scm/git/Thun/blobs/master/docs/notebooks/Remove-Function.ipynb).
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.
------------------------------------------------------------------------
## rest
Basis Function Combinator
Basis Function
([a1 ...0] -- [...0])
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
[a ...] rest
------------------
[...]
### Crosslinks
Lorem ipsum.
[first]
[uncons]
------------------------------------------------------------------------
## reverse
Basis Function Combinator
Function
Reverse the list on the top of the stack. :
Reverse the list on the top of the stack.
reverse == [] swap shunt
### Example
Gentzen diagram.
[1 2 3] reverse
---------------------
[3 2 1]
### Definition
if not basis.
> [\<\{\}] [shunt]
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.
------------------------------------------------------------------------
## rolldown
Basis Function Combinator
Function
(a1 a2 a3 -- a2 a3 a1)
Gentzen diagram.
a b c rolldown
--------------------
b c a
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [swapd] [swap]
### Crosslinks
Lorem ipsum.
[rollup]
------------------------------------------------------------------------
## rollup
Basis Function Combinator
Function
(a1 a2 a3 -- a3 a1 a2)
Gentzen diagram.
a b c rollup
------------------
c a b
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [swap] [swapd]
### Crosslinks
Lorem ipsum.
[rolldown]
--------------
@ -3113,65 +3035,33 @@ See [rolldown](#rolldown).
## round
Basis Function Combinator
Function
Round a number to a given precision in decimal digits.
The return value is an integer if ndigits is omitted or None. Otherwise
the return value has the same type as the number. ndigits may be
negative.
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
Another one that won't make sense until the "numeric tower" is nailed
down.
### Crosslinks
Lorem ipsum.
------------------------------------------------------------------------
## rrest
Basis Function Combinator
([a1 a2 ...1] -- [...1])
Gentzen diagram.
Function
[a b ...] rrest
---------------------
[...]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [rest] [rest]
### Crosslinks
Lorem ipsum.
[rest]
------------------------------------------------------------------------
@ -3193,352 +3083,242 @@ Basis Function
## run
Basis Function Combinator
Function
\<{} infra
Run a quoted program in a list.
Gentzen diagram.
### Example
[1 2 +] run
-----------------
[3]
### Definition
if not basis.
> [\<\{\}] [infra]
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.
------------------------------------------------------------------------
## second
Basis Function Combinator
Function
([a1 a2 ...1] -- a2)
Gentzen diagram.
[a b ...] second
----------------------
b
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [rest] [first]
### Crosslinks
Lorem ipsum.
[first]
[third]
[fourth]
------------------------------------------------------------------------
## select
Basis Function Combinator
Basis Function
Use a Boolean value to select one of two items from a sequence. :
[A B] false select
[a b] false select
------------------------
A
a
[A B] true select
[a b] true select
-----------------------
B
The sequence can contain more than two items but not fewer. Currently
Python semantics are used to evaluate the \"truthiness\" of the Boolean
value (so empty string, zero, etc. are counted as false, etc.)
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
b
### Discussion
Lorem ipsum.
The sequence can contain more than two items but not fewer.
### Crosslinks
Lorem ipsum.
[choice]
------------------------------------------------------------------------
## sharing
Basis Function Combinator
Function
Print redistribution information.
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
Mathematically this is a form of [id], but it has the side-effect of
printing out the GPL notice.
### Crosslinks
Lorem ipsum.
[warranty]
------------------------------------------------------------------------
## shift
Basis Function Combinator
Function
uncons \[swons\] dip
Move the top item from one list to another.
Gentzen diagram.
### Example
[x y z] [a b c] shift
---------------------------
[a x y z] [b c]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [uncons] \[[swons]\] [dip]
### Crosslinks
Lorem ipsum.
[shunt]
------------------------------------------------------------------------
## shunt
Basis Function Combinator
Function
Like concat but reverses the top list into the second. :
Like [concat] but [reverse] the top list into the second.
shunt == [swons] step == reverse swap concat
### Example
[a b c] [d e f] shunt
---------------------------
[f e d a b c]
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[[swons]\] [step]
### Discussion
Lorem ipsum.
This is more efficient than [concat] so prefer it if you don't need to
preserve order.
### Crosslinks
Lorem ipsum.
[concat]
[reverse]
[shift]
------------------------------------------------------------------------
## size
Basis Function Combinator
Function
\[pop ++\] step_zero
Replace a list with its size.
Gentzen diagram.
### Example
[23 [cats] 4] size
------------------------
3
### Definition
if not basis.
> \[[pop] [++]\] [step_zero]
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.
------------------------------------------------------------------------
## sort
Basis Function Combinator
Function
Given a list return it sorted.
Gentzen diagram.
### Example
### Definition
[4 2 5 7 1] sort
----------------------
[1 2 4 5 7]
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.
------------------------------------------------------------------------
## spiral_next
Basis Function Combinator
Function
\[\[\[abs\] ii \<=\] \[\[\<\>\] \[pop !-\] \|\|\] &&\] \[\[!-\]
\[\[++\]\] \[\[\--\]\] ifte dip\] \[\[pop !-\] \[\--\] \[++\] ifte\]
ifte
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
Example code.
### Discussion
Lorem ipsum.
See the ["Square Spiral Example Joy Code" notebook](https://joypy.osdn.io/notebooks/Square_Spiral.html).
### Crosslinks
Lorem ipsum.
------------------------------------------------------------------------
## split_at
Basis Function Combinator
Function
\[drop\] \[take\] clop
Split a list (second on the stack) at the position given by the number on
the top of the stack.
Gentzen diagram.
### Example
[1 2 3 4 5 6 7] 4 split_at
--------------------------------
[5 6 7] [4 3 2 1]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[[drop]\] \[[take]\] [clop]
### Discussion
Lorem ipsum.
Take a list and a number `n` from the stack, take `n` items from the top
of the list and [shunt] them onto a new list that replaces the number `n`
on the top of the stack.
### Crosslinks
Lorem ipsum.
[split_list]
------------------------------------------------------------------------
## split_list
Basis Function Combinator
Function
\[take reverse\] \[drop\] clop
Split a list (second on the stack) at the position given by the number on
the top of the stack such that [concat] would reconstruct the original
list.
Gentzen diagram.
[1 2 3 4 5 6 7] 4 split_list
----------------------------------
[1 2 3 4] [5 6 7]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[[take] [reverse]\] \[[drop]\] [clop]
### Discussion
Lorem ipsum.
Compare with [split_at]. This function does extra work to ensure that
[concat] would reconstruct the original list.
### Crosslinks
Lorem ipsum.
[split_at]
------------------------------------------------------------------------

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@ -2,28 +2,23 @@
## quoted
Basis Function Combinator
Function
\[unit\] dip
"Quote D" Wrap the second item on the stack in a list.
Gentzen diagram.
a b quoted
----------------
[a] b
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[[unit]\] [dip]
### Discussion
Lorem ipsum.
This comes from the original Joy stuff.
### Crosslinks
Lorem ipsum.
[unit]

30
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@ -2,28 +2,30 @@
## range
Basis Function Combinator
Function
\[0 \<=\] \[1 - dup\] anamorphism
Expect a number `n` on the stack and replace it with a list:
`[(n-1)...0]`.
Gentzen diagram.
### Example
5 range
-----------------
[4 3 2 1 0]
-5 range
--------------
[]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[0 \<=\] \[1 - [dup]\] [anamorphism]
### Discussion
Lorem ipsum.
If `n` is less than 1 the resulting list is empty.
### Crosslinks
Lorem ipsum.
[range_to_zero]

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@ -2,28 +2,27 @@
## range_to_zero
Basis Function Combinator
Function
unit \[down_to_zero\] infra
Take a number `n` from the stack and replace it with a list
`[0...n]`.
Gentzen diagram.
### Example
5 range_to_zero
---------------------
[0 1 2 3 4 5]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> [unit] \[[down_to_zero]\] [infra]
### Discussion
Lorem ipsum.
Note that the order is reversed compared to [range].
### Crosslinks
Lorem ipsum.
[down_to_zero]
[range]

26
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@ -2,28 +2,20 @@
## reco
Basis Function Combinator
Function
rest cons
Replace the first item in a list with the item under it.
Gentzen diagram.
a [b ...] reco
--------------------
[a ...]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [rest] [cons]
### Crosslinks
Lorem ipsum.
[codireco]
[make_generator]

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@ -2,34 +2,17 @@
## remove
Basis Function Combinator
Function
Expects an item on the stack and a quote under it and removes that item
from the the quote. The item is only removed once. If the list is empty
or the item isn\'t in the list then the list is unchanged. :
or the item isn't in the list then the list is unchanged.
[1 2 3 1] 1 remove
[1 2 3 1] 1 remove
------------------------
[2 3 1]
Gentzen diagram.
[2 3 1]
### Definition
if not basis.
See the ["Remove Function" notebook](https://osdn.net/projects/joypy/scm/git/Thun/blobs/master/docs/notebooks/Remove-Function.ipynb).
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.

28
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@ -2,28 +2,14 @@
## rest
Basis Function Combinator
Basis Function
([a1 ...0] -- [...0])
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
[a ...] rest
------------------
[...]
### Crosslinks
Lorem ipsum.
[first]
[uncons]

27
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@ -2,30 +2,17 @@
## reverse
Basis Function Combinator
Function
Reverse the list on the top of the stack. :
Reverse the list on the top of the stack.
reverse == [] swap shunt
### Example
Gentzen diagram.
[1 2 3] reverse
---------------------
[3 2 1]
### Definition
if not basis.
> [\<\{\}] [shunt]
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.

25
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@ -2,28 +2,17 @@
## rolldown
Basis Function Combinator
Function
(a1 a2 a3 -- a2 a3 a1)
Gentzen diagram.
a b c rolldown
--------------------
b c a
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [swapd] [swap]
### Crosslinks
Lorem ipsum.
[rollup]

25
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@ -2,28 +2,17 @@
## rollup
Basis Function Combinator
Function
(a1 a2 a3 -- a3 a1 a2)
Gentzen diagram.
a b c rollup
------------------
c a b
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [swap] [swapd]
### Crosslinks
Lorem ipsum.
[rolldown]

26
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@ -2,32 +2,12 @@
## round
Basis Function Combinator
Function
Round a number to a given precision in decimal digits.
The return value is an integer if ndigits is omitted or None. Otherwise
the return value has the same type as the number. ndigits may be
negative.
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
Another one that won't make sense until the "numeric tower" is nailed
down.
### Crosslinks
Lorem ipsum.

26
docs/reference/rrest.md
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@ -2,28 +2,16 @@
## rrest
Basis Function Combinator
([a1 a2 ...1] -- [...1])
Gentzen diagram.
Function
[a b ...] rrest
---------------------
[...]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [rest] [rest]
### Crosslinks
Lorem ipsum.
[rest]

27
docs/reference/run.md
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@ -2,28 +2,17 @@
## run
Basis Function Combinator
Function
\<{} infra
Run a quoted program in a list.
Gentzen diagram.
### Example
[1 2 +] run
-----------------
[3]
### Definition
if not basis.
> [\<\{\}] [infra]
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.

27
docs/reference/second.md
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@ -2,28 +2,19 @@
## second
Basis Function Combinator
Function
([a1 a2 ...1] -- a2)
Gentzen diagram.
[a b ...] second
----------------------
b
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [rest] [first]
### Crosslinks
Lorem ipsum.
[first]
[third]
[fourth]

34
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@ -2,41 +2,23 @@
## select
Basis Function Combinator
Basis Function
Use a Boolean value to select one of two items from a sequence. :
[A B] false select
[a b] false select
------------------------
A
a
[A B] true select
[a b] true select
-----------------------
B
The sequence can contain more than two items but not fewer. Currently
Python semantics are used to evaluate the \"truthiness\" of the Boolean
value (so empty string, zero, etc. are counted as false, etc.)
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
b
### Discussion
Lorem ipsum.
The sequence can contain more than two items but not fewer.
### Crosslinks
Lorem ipsum.
[choice]

22
docs/reference/sharing.md
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@ -2,28 +2,16 @@
## sharing
Basis Function Combinator
Function
Print redistribution information.
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
Mathematically this is a form of [id], but it has the side-effect of
printing out the GPL notice.
### Crosslinks
Lorem ipsum.
[warranty]

27
docs/reference/shift.md
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@ -2,28 +2,21 @@
## shift
Basis Function Combinator
Function
uncons \[swons\] dip
Move the top item from one list to another.
Gentzen diagram.
### Example
[x y z] [a b c] shift
---------------------------
[a x y z] [b c]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
> [uncons] \[[swons]\] [dip]
### Crosslinks
Lorem ipsum.
[shunt]

26
docs/reference/shunt.md
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@ -2,34 +2,28 @@
## shunt
Basis Function Combinator
Function
Like concat but reverses the top list into the second. :
Like [concat] but [reverse] the top list into the second.
shunt == [swons] step == reverse swap concat
### Example
[a b c] [d e f] shunt
---------------------------
[f e d a b c]
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[[swons]\] [step]
### Discussion
Lorem ipsum.
This is more efficient than [concat] so prefer it if you don't need to
preserve order.
### Crosslinks
Lorem ipsum.
[concat]
[reverse]
[shift]

27
docs/reference/size.md
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@ -2,28 +2,17 @@
## size
Basis Function Combinator
Function
\[pop ++\] step_zero
Replace a list with its size.
Gentzen diagram.
### Example
[23 [cats] 4] size
------------------------
3
### Definition
if not basis.
> \[[pop] [++]\] [step_zero]
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.

25
docs/reference/sort.md
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@ -2,28 +2,13 @@
## sort
Basis Function Combinator
Function
Given a list return it sorted.
Gentzen diagram.
### Example
### Definition
[4 2 5 7 1] sort
----------------------
[1 2 4 5 7]
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.

25
docs/reference/spiral_next.md
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@ -2,30 +2,11 @@
## spiral_next
Basis Function Combinator
Function
\[\[\[abs\] ii \<=\] \[\[\<\>\] \[pop !-\] \|\|\] &&\] \[\[!-\]
\[\[++\]\] \[\[\--\]\] ifte dip\] \[\[pop !-\] \[\--\] \[++\] ifte\]
ifte
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
Example code.
### Discussion
Lorem ipsum.
See the ["Square Spiral Example Joy Code" notebook](https://joypy.osdn.io/notebooks/Square_Spiral.html).
### Crosslinks
Lorem ipsum.

28
docs/reference/split_at.md
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@ -2,28 +2,28 @@
## split_at
Basis Function Combinator
Function
\[drop\] \[take\] clop
Split a list (second on the stack) at the position given by the number on
the top of the stack.
Gentzen diagram.
### Example
[1 2 3 4 5 6 7] 4 split_at
--------------------------------
[5 6 7] [4 3 2 1]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[[drop]\] \[[take]\] [clop]
### Discussion
Lorem ipsum.
Take a list and a number `n` from the stack, take `n` items from the top
of the list and [shunt] them onto a new list that replaces the number `n`
on the top of the stack.
### Crosslinks
Lorem ipsum.
[split_list]

26
docs/reference/split_list.md
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@ -2,28 +2,26 @@
## split_list
Basis Function Combinator
Function
\[take reverse\] \[drop\] clop
Split a list (second on the stack) at the position given by the number on
the top of the stack such that [concat] would reconstruct the original
list.
Gentzen diagram.
[1 2 3 4 5 6 7] 4 split_list
----------------------------------
[1 2 3 4] [5 6 7]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[[take] [reverse]\] \[[drop]\] [clop]
### Discussion
Lorem ipsum.
Compare with [split_at]. This function does extra work to ensure that
[concat] would reconstruct the original list.
### Crosslinks
Lorem ipsum.
[split_at]

25
docs/reference/sqr.md
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@ -2,28 +2,15 @@
## sqr
Basis Function Combinator
Function
dup \*
Square the number on the top of the stack.
Gentzen diagram.
n sqr
------------
n²
### Definition
if not basis.
> [dup] [mul]
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.

19
docs/reference/sqrt.md
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@ -7,24 +7,7 @@ Basis Function Combinator
Return the square root of the number a. Negative numbers return complex
roots.
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
Another "numeric tower" hatch...
### Crosslinks
Lorem ipsum.

26
docs/reference/stack.md
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@ -2,28 +2,26 @@
## stack
Basis Function Combinator
Function
(... -- ... [...])
Put the stack onto the stack.
Gentzen diagram.
... c b a stack
---------------------------
... c b a [a b c ...]
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
> \[\] [swaack] [dup] [swaack] [first]
### Discussion
Lorem ipsum.
This function forms a pair with [unstack], and together they form the
complement to the "destructive" pair [enstacken] and [disenstacken].
### Crosslinks
Lorem ipsum.
[unstack]
[enstacken]
[disenstacken]

27
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@ -2,28 +2,17 @@
## stackd
Basis Function Combinator
Function
\[stack\] dip
Grab the stack under the top item and put it onto the stack.
Gentzen diagram.
### Example
... 1 2 3 stackd
------------------------
... 1 2 [2 1 ...] 3
### Definition
if not basis.
> \[[stack]\] [dip]
### Derivation
if not basis.
### Source
if basis
### Discussion
Lorem ipsum.
### Crosslinks
Lorem ipsum.

42
docs/reference/step.md
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@ -2,45 +2,29 @@
## step
Basis Function Combinator
Combinator
Run a quoted program on each item in a sequence. :
Run a quoted program on each item in a sequence.
... [] [Q] . step
-----------------------
... .
... [] [Q] step
---------------------
...
... [a] [Q] . step
------------------------
... a . Q
... [a] [Q] step
----------------------
... a Q
... [a b c] [Q] . step
... [a b c] [Q] . step
----------------------------------------
... a . Q [b c] [Q] step
The step combinator executes the quotation on each member of the list on
top of the stack.
Gentzen diagram.
### Definition
if not basis.
### Derivation
if not basis.
### Source
if basis
... a . Q [b c] [Q] step
### Discussion
Lorem ipsum.
See the [Recursion Combinators notebook](https://joypy.osdn.io/notebooks/Recursion_Combinators.html).
### Crosslinks
Lorem ipsum.
[step_zero]

2
docs/reference/step_zero.md
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@ -2,7 +2,7 @@
## step_zero
Basis Function Combinator
Combinator
0 roll> step