jedishrfu's latest activity
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Astrophysics is on a quest to discover if Earth is a cosmic rarity or just one of many "Goldilocks" worlds. Much of this hope rests on... -
jedishrfu reacted to Mark44's post in the thread Undergrad Infinity and 0 (null set) do not exist with
Like.
I was tacitly assuming that "not allowed in equations" did not include limit expressions, limits of summations, or definite integral... -
jedishrfu reacted to gmax137's post in the thread Undergrad Infinity and 0 (null set) do not exist with Like.
I think that is overstating, see, e.g. $$\frac \pi 4 = \sum_{k=0}^\infty \frac {(-1)^k} {2k+1}$$ Oops, it seems @jedishrfu beat me to...
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jedishrfu reacted to PeroK's post in the thread Undergrad Infinity and 0 (null set) do not exist with Like.
There are several uses of term "infinite", "infinity", or the symbol ##\infty## in mathematics. The natural numbers, for example, is an...
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jedishrfu replied to the thread Undergrad Infinity and 0 (null set) do not exist.There is one place where infinity is allowed in math as the symbolic end of a limit expression to mean there is no end and it's found in...
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jedishrfu reacted to JimWhoKnew's post in the thread High School Looking for an English translation of Levi-Civita's 1926 paper "Sur l'écart géodésique" ("On the geodesic deviation") with Like.
It seems that parts of the paper are Italian-to-French translation of the first edition of the book, so they are almost identical to the...
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jedishrfu replied to the thread Insights Thinking Outside The Box Versus Knowing What’s In The Box.My favorite out-of-the-box experience is the Scarecrow in The Wizard of Oz (1939). On several occasions, he comes up with novel...
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jedishrfu replied to the thread High School Looking for an English translation of Levi-Civita's 1926 paper "Sur l'écart géodésique" ("On the geodesic deviation").The recommendation I got was to use his book, as mentioned in an earlier post by @romsofia, as a basis, and to look for modern...
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jedishrfu reacted to sophiecentaur's post in the thread Apple trackpad: is it still the thing to go for? with Like.
They are both related to 'handwriting' but the trackpad needs less acreage to work on than a mouse - and it's already got a surface to...
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jedishrfu replied to the thread Graduate Quantum interpretations and indistinguishable elementary particles.Since the OPs question has been answered multiple times in this thread, this is a good time to close it. Thank you all for contributing...
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jedishrfu replied to the thread Rigorous Elementary Functions.Yeah, my take was he was trying to find a programming building block for symbolic regression and evolutionary equation discovery. He...
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jedishrfu replied to the thread Rigorous Elementary Functions.Have you seen the recent ArXiv preprint paper by Andrzej Odrzyvolek https://arxiv.org/html/2603.21852v2 It's related to your...
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jedishrfu replied to the thread Apple trackpad: is it still the thing to go for?.The trackpad is definitely a cool input device, but so is a mouse. I have a trackpad in my MacBook Air M2 and use it whenever I don't...
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jedishrfu replied to the thread Apple trackpad: is it still the thing to go for?.The trackpad is definitely a cool input device, but so is a mouse. I have a trackpad in my MacBook Air M2 and use it whenever I don't...
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jedishrfu replied to the thread Schools Seeking advice on choosing between Manchester, Durham, and Nottingham.Gerard t’Hooft, a world class physicist, has a website devoted to the path of a theoretical physicist...