Is 1-1+1-1+1-1+...=1/2 really true? @blackpenredpen
Is 1-1+1-1+1-1+...=1/2 really true? @blackpenredpen
Uploaded April 2026 | Updated September 2026, 2 weeks ago
Math tutorial answering the question from Reddit, why 1-1+1-1+1-1+... is 1/2? This is known as the Grandi's series. This question is from Reddit r/homeworkhelp
reddit.com/r/HomeworkHelp/s/mG2OPxABKx

Related links
1+2+3+...=-1/12 by@numberphile youtu.be/w-I6XTVZXww?si=9aEG3INL9delT4LI
CesΓ ro Summation: en.wikipedia.org/wiki/Ces%C3%A0ro_summation
Ramanujan Summation: en.wikipedia.org/wiki/Ramanujan_summation
Cauchy Principal Value: en.wikipedia.org/wiki/Cauchy_principal_value

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Is 1-1+1-1+1-1+...=1/2 really true?

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