What's the difference between Polymorphism and Multiple Dispatch?

Question

...or are they the same thing? I notice that each has its own Wikipedia entry: Polymorphism, Multiple Dispatch, but I\'m having trouble seeing how the concepts differ.

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Answer 1

if you want the conceptual equivalent of a method invocation

(obj_1, obj_2, ..., obj_n)->method

to depend on each specific type in the tuple, then you want multiple dispatch. Polymorphism corresponds to the case n=1 and is a necessary feature of OOP.