What are the best (portable) cross-platform arbitrary-precision math libraries? [closed]

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GMP is the popular choice. Squeak Smalltalk has a very nice library, but it’s written in Smalltalk.

You asked for relevant books or articles. The tricky part of bignums is long division. I recommend Per Brinch Hansen’s paper Multiple-Length Division Revisited: A Tour of the Minefield.

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