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the claim

The product of two negative numbers is a positive number.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 1 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the product of two negative numbers is a positive number?

Yes. A history-of-mathematics article and a study of Bhāskara II's algebra both state the standard rule that the product of two negative numbers is positive; a mathematics Q&A offers an informal argument for the same rule. One 2024 paper contests the rule only for its author's nonstandard 'negatively directed' numbers.

Verdict: SUPPORTED · 4 sources for, 1 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 4
On Multiplying Negative Numbers.
1985
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L., C. M. & A., D. K. (1985). On Multiplying Negative Numbers.. eric.ed.gov. https://eric.ed.gov/?id=EJ318910

Evidence against · 1
A NOVEL CONCEPT: THE PRODUCT OF TWO NEGATIVELY DIRECTED NUMBERS IS A NEGATIVELY DIRECTED NUMBER THOUGH THE NEGATIVE OF A NEGATIVE NUMBER IS A POSITIVE NUMBER
2024
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Bhattacharyya, P. C. (2024). A NOVEL CONCEPT: THE PRODUCT OF TWO NEGATIVELY DIRECTED NUMBERS IS A NEGATIVELY DIRECTED NUMBER THOUGH THE NEGATIVE OF A NEGATIVE NUMBER IS A POSITIVE NUMBER. doi.org. https://doi.org/10.26782/jmcms.2024.10.00001

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More for · 3
Explanation about product of two negative numbers being ...
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Explanation about product of two negative numbers being.... (n.d.). math.stackexchange.com. https://math.stackexchange.com/questions/1429494/explanation-about-product-of-two-negative-numbers-being-positive

Concept of Positive and Negative in the Bījagaṇita of Bhāskarācārya II and Its Modern Representation
2026
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Concept of Positive and Negative in the Bījagaṇita of Bhāskarācārya II and Its Modern Representation. (2026). doi.org. https://doi.org/10.5281/zenodo.19404365

Discussion
1926
Get citation
Discussion. (1926). doi.org. https://doi.org/10.5951/mt.19.7.0429

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