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tit:product
type:$type_both
alias:prod, multiply
syntax:!product ``fn'' for ``v''=``v1'' to ``v2'' [step ``st'']\
$ !product ``fn'' for ``v'' in ``v1,v2,v3,...''
mean:Computes the product of a function ``fn(v)'' with variable ``v'' replaced \
successively by values ``v1'', ..., ``v2''. <p>\
In the second syntax
, the values are given with respect to
each item in the
list ``v1
,v2
,...''.\
</p>