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Fold a constant sum that comes to a number before the integral is asked - #1902
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Rafael-SOWNet merged 3 commits intoOct 16, 2026
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2 + 2 a - 2 (1 + a) is 0 and 1 + 2 n - 2 (1 + n) is -1 once multiplied out, which neither the simplification nor the rules reading a coefficient or an exponent see. Rubi's 1.2.2.2 1/sqrt(a + (2 + 2 c - 2 (1 + c)) x^4) and 1/sqrt(2 + 2 a - 2 (1 + a) + c x^4), and 1.1.1.2 (c + d x)^(1 + 2 n - 2 (1 + n))/(a + b x)^2, were declined. Part of #718 Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012sonx8iAspMiwRwokT1Ura
…olded-before-the-question
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012sonx8iAspMiwRwokT1Ura
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Part of #718.
Rubi spells a zero coefficient
2 + 2 a - 2 (1 + a)and an exponent of-1as1 + 2 n - 2 (1 + n). Neither the simplification nor the rules that read a coefficient or an exponent see through either, so1/sqrt(2 + 2 a - 2 (1 + a) + c x^4)was declined where1/sqrt(c x^4)is answered.SolveByFoldingConstantSumsToTheirNumbersruns first in the dispatcher, on the question asked only. It takes the terms of each sum that are free of the variable. If one of them holds a product with a sum in it, and together they multiply out to a number, it writes that number in their place and asks the result as the same question. A sum that multiplies out to anything other than a number, such asm + 2 (1 + n), is left alone; a test pins that.Checks
ConstantSumsFoldedToTheirNumbersIntegralTest: 5 cases.Corpus, measured against master 55a8044 (this branch then merged 314a8cc):
No losses and no row slower than 2× master + 200 ms. Gate passed; suite 15,418 passed, 0 failed.
1.2.2.2:1149,
1/sqrt(a + (2 + 2 c - 2 (1 + c)) x^4), was answered by 2.5.0 asx/sqrt(a)and declined on master. This restores it. #1901 also answers 1.2.2.2:1138, in 119 characters; folded first, it is 44. One answer 2.5.0 gave changes form:(2 + 2 c - 2 (1 + c)) x^4integrates to0, which BREAKING-CHANGES.md records. 1149 has no entry, since its answer is the one 2.5.0 gave.🤖 Generated with Claude Code
https://claude.ai/code/session_012sonx8iAspMiwRwokT1Ura