I'm really glad your students are learning about the factorial
function. It is an excellent introduction to arithmetical functions,
concepts like domain,
empty
sums (which have natural meaning as 0),
and empty products (which, contrary to many people's intuition, is
actually 1, the multiplicative identity). Unfortunately, while a
discussion of the gamma function is beyond the scope of an 8th grade
class, it is nevertheless fascinating and stimulating to show the
means by which functions can be often be generalized to cover a larger
domain, and further this generalization can be made unique - this is
analytic continuation. In particular:
I'm really glad your students are learning about the factorial function. It is an excellent introduction to arithmetical functions, concepts like domain, empty sums (which have natural meaning as 0), and empty products (which, contrary to many people's intuition, is actually 1, the multiplicative identity). Unfortunately, while a discussion of the gamma function is beyond the scope of an 8th grade class, it is nevertheless fascinating and stimulating to show the means by which functions can be often be generalized to cover a larger domain, and further this generalization can be made unique - this is analytic continuation. In particular:
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