On Tue, 01 Sep 2009 at 11:42PM -0700, Robert Bradshaw wrote: > If we support the ! notation, we should either have x!! == (x!)! or, > preferably, x!!..! be the multi factorial (not limiting ourselves to > single and double).
I study combinatorics, and I'm fine with *not* supporting ! notation. Writing "factorial(x)" is obvious and unambiguous. If you want something shorter, you can do "f = factorial". Then the mysterious and ambiguous examples above turn into something obvious: f(f(5)) or whatever. We already have "multifactorial" support: (5).multifactorial(2) equals 5 * 3 * 1, and so on. I don't see anyone strongly demanding ! notation, so I say we drop the idea. We have factorial() and .multifactorial(), they work perfectly well, and the syntax for using them is the same as in the rest of Sage. Dan -- --- Dan Drake ----- http://mathsci.kaist.ac.kr/~drake -------
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