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Re: Using a logical Or in the function definition
ahallam at iastate.edu wrote: > I would like to use Or in the function definition as in > > ab[ Or[r_Integer,r_Rational], Or[s_Integer,s_Rational] ]:=r/s; > > In other words, I want the function to take integers or ratios of > integers as arguments, but not real numbers which are not rational. Probably I do not understand your problem, but every Integer is also Rational, so you can use something like ab[r_/;Element[r,Rationals], s_/;Element[s,Rationals]] := r/s; instead of Element[r,Rationals] you can type r [Esc]el[Esc] Rationals where [Esc] is the Esc key. g. g.