ohwilleke's latest activity
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ohwilleke replied to the thread Announcement PF Style 2026.Ugh! Not a fan of the forest green and earth tones. Also, the font used for "Today, 7:31 AM" in light gray, maybe Courier, is hard on... -
ohwilleke reacted to loop quantum gravity's post in the thread Undergrad Published electroweak coincidences with
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Is it only me, but Veltman equation reminds me of Mandelstam variables. https://en.wikipedia.org/wiki/Mandelstam_variables -
ohwilleke reacted to Steve4Physics's post in the thread Prove that ## 4\tan^{-1}\left[\dfrac{1}{5}\right]- \tan^{-1}\left[\dfrac{1}{239}\right]= \dfrac{π}{4}## with Like.
For an essentially geometric proof (no standard trig' identities used) see this 3 minute (appox.) video.
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ohwilleke reacted to Gavran's post in the thread Prove that ## 4\tan^{-1}\left[\dfrac{1}{5}\right]- \tan^{-1}\left[\dfrac{1}{239}\right]= \dfrac{π}{4}## with Like.
There are four formulas of this kind. Euler's formula $$ \arctan\frac12+\arctan\frac13=\frac\pi4 $$ Hermann's formula $$...
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ohwilleke reacted to MatinSAR's post in the thread Prove that ## 4\tan^{-1}\left[\dfrac{1}{5}\right]- \tan^{-1}\left[\dfrac{1}{239}\right]= \dfrac{π}{4}## with Like.
I'm not sure what you did ... What I've done: Prove that: ## 4\tan^{-1}\left[\dfrac{1}{5}\right]-...