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## ifte

Basis Function Combinator

If-Then-Else Combinator :

    ... [if] [then] [else] ifte
    ---------------------------------------------------
    ... [[else] [then]] [...] [if] infra select i




    ... [if] [then] [else] ifte
    -------------------------------------------------------
    ... [else] [then] [...] [if] infra first choice i

Has the effect of grabbing a copy of the stack on which to run the
if-part using infra.

Gentzen diagram.

### Definition

if not basis.

### Derivation

if not basis.

### Source

if basis

### Discussion

Lorem ipsum.

### Crosslinks

Lorem ipsum.