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