Newest Questions

0 votes

0 answers

19 views

History of the "typewriter" sequence

Can someone please give us some history on the so-called "typewriter" sequence of functions that is often used to show that $L^p$-norm convergence does not imply the almost-everywhere (or ...

10 votes

4 answers

3k views

Why didn't Eratosthenes consider the Pole Star?

This question might have an easy answer, since it occurred to me only recently and I haven't given it ages of thought. We all applaud Eratosthenes for his brilliance in realizing that, by comparing ...

2 votes

1 answer

141 views

Why did the SI choose $h$ instead of $\hbar$?

"In 1899, Max Planck introduced what became later known as the Planck constant. At the end of the paper, Planck proposed, as a consequence of his discovery, the base units later named in his ...

asked Feb 14 at 17:16

3 votes

0 answers

59 views

Who introduced the term "Knudsen number"?

For the context of my work, I would like to provide the original source for the Knudsen number $Kn = \frac{\lambda}{L}$ (idicating the rarefication of gas, where $\lambda$ is the gas molecules' mean ...

2 votes

0 answers

77 views

Question about Riemann in Jeremy Gray's article

I kept searching a lot regarding this topic. So I read this great article by Jeremy Gray "From the history of a simple group". Riemann's "Theorie der Abelschen Functionen" ...

asked Feb 14 at 9:27

-5 votes

1 answer

126 views

The Law of Conservation of Energy and the Illusive Real Reference Frame, why has no one in history seriously discussed this issue? [closed]

Suppose you are a train boilerman, and you know the total mass of the fuel you put in. Multiply it by the gravimetric energy density of the fuel itself, and you can calculate the total chemical energy ...

asked Feb 13 at 6:38

2 votes

1 answer

62 views

What are the chain rule's earlier and newer formulation?

Background In this post they link this paper about the history of the chain rule. It's in the context of about the educational / pedagogical aspect and possibly error of using the definition of the ...

asked Feb 10 at 12:08

3 votes

1 answer

73 views

Books like "Sources of Quantum Mechanics"?

Van der Waerden's Sources of QM is a fascinating book. It is a compilation of several historical papers from the earliest parts of the development of Quantum Mechanics, along with commentary (although ...

0 votes

0 answers

44 views

Whos discovered the inequality $\log N<\sum_{n=1}^{N}\frac{1}{n}<1+\log N$ for finite sum of harmonic series?

I was reading an article from MSE, and it is about an inequality of finite sum of harmonic series $$\log N<\sum_{n=1}^{N}\frac{1}{n}<1+\log N$$ It looks quite beautiful, and I am wondering who ...

asked Feb 7 at 4:55

0 votes

0 answers

74 views

A topological proof of the fundamental theorem of arithmetic

I have found a paper with a topological proof of the Fundamental Theorem of Arithmetic (published in The Mathematics Student by the Indian Mathematical Society, Vol. 93, Part 3-4, 2024). You can find ...