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Sage symbolic math simplification error

asked 2020-09-06 20:22:43 -0500

updated 2020-09-07 02:26:22 -0500

tmonteil gravatar image

In sagemath version 9.1, the code

product(1-q^x, x, 1, N)


-(-1)^N*product(q^x - 1, x, 1, N)

while the correct result ought to be

(-1)^N*product(q^x - 1, x, 1, N)

What went wrong? Where did this sign change come from?

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answered 2020-09-07 02:26:12 -0500

tmonteil gravatar image

This is definitely a bug, thanks for reporting, it is now trac ticket 30520

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