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Top new questions this week:

Who first proved that there is no five-digit perfect number?

A perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. The first five perfect numbers are 6, 28, 496, 8128, and 33550336. Nicomachus ...

mathematics number-theory  
asked by A. Rex Score of 4

Seeking quotes rejecting early forms of the Dirac delta

Question Why is Dirac delta named after Dirac when the concept was already over two centuries old? notes the Dirac delta function effectively appeared centuries before Dirac. This was long before the ...

real-analysis harmonic-analysis fourier  
asked by Colin McLarty Score of 4

In which work was Boltzmann's entropy originally introduced?

I get an impression from this enyclopedia entry that the primary source of the Boltzmann entropy equation $S = k \log W$ might be 1866, Über die Mechanische Bedeutung des Zweiten Hauptsatzes der ...

physics reference-request thermodynamics boltzmann entropy  
asked by Galen Score of 3

How were the values of permeability and permittivity derived?

Do you know how the values were measured and if they where determined by particular conditions/ restraints? They can be put to 1 (or to any values, I suppose); what escapes me is why 1/ε × μ must be ...

asked by user157860 Score of 2
answered by Mauricio Score of 2

Computing Gravitational constant G from Cavendish's data

I'm trying to compute the value of G from Cavendish's own observations. I get $G_{Cav}=5.27501×10^{−10}$ which is 8 times bigger than the accepted value of $G_{True}=6.67430×10^{−11}$. Do you see ...

experimental-physics gravity  
asked by zeynel Score of 2

Who was G. H. Hardy's Tripos coach?

There is conflicting opinion as to who was Hardy's Tripos coach. The Wikipedia page on Hardy claims it was R. A. Herman, a claim that appears to be backed up by Leonard Roth in his article "Old ...

asked by Chris Leary Score of 1

Simultaneous independent or semi-independent solutions to problems

This is a request for help (with examples, as described below) with a talk I giving to graduate students regarding the dynamics of mathematical research among mathematicians and the development of key ...

asked by Jack LeGrüß Score of 1

Greatest hits from previous weeks:

Which mathematician traveled to and moved in with each collaborator?

I remember a video, perhaps a Numberphile episode where a mathematician was described who would simply move in to the home of a collaborator with which they were engaged to so that they could work ...

mathematics mathematicians biographical-details  
asked by uhoh Score of 15

What is the origin of polynomials and notation for them?

This may be quite a broad question, but lately I've been wondering about the history behind polynomials. Nowadays these are pretty much the simplest kind of functions to work with, but I'd like to ...

mathematics discoveries notation philosophy-of-science  
asked by hjhjhj57 Score of 16
answered by Conifold Score of 15

What was the historical context of the development of Taylor series?

I knew about linear approximations, quadratic approximations and the use of Taylor polynomials to approximate a function. Furthermore, I was aware of other applications of Taylor polynomials and the ...

asked by shahed al mamun Score of 19
answered by Conifold Score of 18

What was the first electronic computer?

I would like to know what is considered to be the first electronic digital computer. A literature ambiguous on this. I found these claims: ENIAC - a computer constructed by Mr. Eckert and Mr. ...

computation computers  
asked by Martin Vesely Score of 13

Origin of 360 degrees?

This is by far one of the most challenging and popular HSM questions on the Net. Proofs are, countless discussions about it in math forums. The answers only led to two theories, which Wikipedia does a ...

mathematics archaeoastronomy  
asked by M.A.R. Score of 18
answered by fdb Score of 16

What hair color did Évariste Galois have?

There is one historic black and white portrait of Évariste Galois that is often used [1]. However there are a number of more recent colorful portraits that imagine him to be anything from straw blond[...

biographical-details galois france  
asked by worldsmithhelper Score of 13
answered by njuffa Score of 32

Where did Galileo say "All truths are easy to understand once they are discovered. The point is to discover them."?

I've heard it claimed Galileo said or wrote: All truths are easy to understand once they are discovered. The point is to discover them. Where did he say this?

reference-request quote galileo  
asked by Geremia Score of 1
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