------------------------------------------------------------------------

# getitem

Basis Function Combinator

    getitem == drop first

Expects an integer and a quote on the stack and returns the item at the
nth position in the quote counting from 0. :

    [a b c d] 0 getitem
    -------------------------
     a

Gentzen diagram.

## Definition

if not basis.

## Derivation

if not basis.

## Source

if basis

## Discussion

## Crosslinks