document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=813394>Question 813394</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many onto functions are there from a set with three elements to a set with eight<BR>\n" );
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document.write( "An \"onto\" function requires that each element of the \"to\" set is mapped to by an element from the \"from\" set. But a function requires that each element of the \"from\" set (the x values) be used no more than once. It is impossible to map all eight elements of the \"to\" using the three element from the \"from\" set only once. IOW: The \"from\" set must have as many or more elements than the \"to\" set in order to have an \"onto\" function. </SPAN>\n" );
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