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- 'isempty : int X Array( int, dim) -> Boolean
- 'isempty( index, v) = ( index == 0 )
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- 'isfull : int X Array( int, dim) -> Boolean
- 'isfull( index, v) = ( index >= dim )
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- 'push : int X Array( int, dim) X int -> int X Array( int, dim)
- 'push( index, v, x) = ( index + 1, e( index, x, v))
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- 'pop : int X Array( int, dim) -> int X Array( int, dim) X int
- 'pop( index, v) = ( index - 1, v, v[index - 1])
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