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John Cook
28,873 followers -
Applied mathematician, consultant, expert witness
Applied mathematician, consultant, expert witness

28,873 followers
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Matrix multiplication is associative: (AB)C = A(BC). But it might take a lot longer to compute the product ABC one way rather than the other, depending on the shapes of the matrices.

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Higher order Taylor series in several variables, without using tensors.

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It may melt by daybreak, but at the moment there’s snow on the ground in Houston! I haven’t seen more than a couple millimeters of snow here before.
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Today's exponential sum
https://www.johndcook.com/expsum/
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Relating moment generating functions to other things:

Laplace transform
Fourier transform
z-transform
probability generating functions

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Exponential sums for "November 31" and December 1.
https://www.johndcook.com/expsum/
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12/1/17
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Watch the accumulation of the partial sums of an exponential sum
https://www.johndcook.com/expsum/index.php?y=17&m=11&d=1
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New post: Contour plots of partial sums of the power series for the gamma function.

https://www.johndcook.com/blog/2017/11/29/gamma-function-partial-sums/
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Found out about a great used book store in Houston: Kaboom Books. I'd driven past it many times and never noticed it. Found this gem there:
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