zero?
-- vonuvoli
Definition predicate
;
Procedure variants:
((number-zero |1...|) -> (true))
number-zero
;...
-- at least one time;true
;((number |1...|) -> (false))
vs:arithmetic
-- (vonuvoli arithmetic)
;vs:base
-- (vonuvoli base)
;number-zero
;true
;number
;false
;