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History and philosophy of mathematics, biographies of mathematicians, mathematics education, recreational mathematics, communication of mathematics.

3 votes

Papers that debunk common myths in the history of mathematics

One persistent (and quite annoying) myth is the one about the incident between Leonard Euler and Denis Diderot visiting the court of Catherine II at St.Petersburg in 1773. This article documents its o …
Pietro Majer's user avatar
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1 vote

Another chicken or egg: sequence or series

Why shouldn’t they come together? Here’s a possible program. The first object to appear, in an elementary course of analysis, if one starts by an axiomatic presentation of $\mathbb R$, is the supremum …
Pietro Majer's user avatar
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18 votes

Abstract thought vs calculation

A beautiful classical example from Functional Analysis is the Hausdorff moment problem: characterize the sequences $m:=(m_0,m_1,\dots)$ of real numbers that are moments of some positive, finite Borel …
Martin Sleziak's user avatar
4 votes

When did we stop the challenges between two mathematicians?

Trying an educated guess: the practice stopped in connection with Johannes Gutenberg's invention of the printing press. After that, it became harder and harder, and not so worthwhile, keeping one's ow …
Pietro Majer's user avatar
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28 votes

Why is it still common to not motivate results in publications?

There is a small ambiguity in the expression motivate a result. You seem to use it for (A): "explain why the authors came out with certain arguments, definitions, methods etc, in order to prove the re …
Community's user avatar
  • 1
6 votes

Who invented the expression "pairwise different" and what is its advantage over "different"

However "distinct" may have the weaker meaning of not all coinciding. So, in case I would therefore use pairwise, for clarity (see e.g. here), like in the other situations you listed. The fact is tha …
Pietro Majer's user avatar
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11 votes

Origin of the noun "mathematician"

In classic Greek, μάθημα is a neuter noun, formed by a standard procedure from the root of the verb μανθάνω, to learn, and denotes in general the object of learning. Also standard is the derivation of …
Pietro Majer's user avatar
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20 votes

Examples of simultaneous independent breakthroughs

The solution of Hilbert's nineteenth problem, in 1957, by Ennio De Giorgi and John Nash, few months later.
Pietro Majer's user avatar
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4 votes

Integrating powers without much calculus

I think it is also worth looking at the case $p=-1$, in the spirit of your context. It also provides a nice way to introduce the logarithm and the exponential function (quite closely to the historica …
Pietro Majer's user avatar
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11 votes
Accepted

Correct spelling of names, Chebyshev and Cholesky

Here you can hear the pronounce by a Russian speaking person. As to the romanization, which usually does have a standard form in any language, I'd use the one of the language you are writing in your …
YCor's user avatar
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19 votes
Accepted

Who first used the word "Simplex"?

According to Jeff Miller's Earliest Known Uses of Some of the Words of Mathematics, the first known occurrence is in Schoute’s Mehrdimensionale Geometrie of 1902.
j.c.'s user avatar
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14 votes

real symmetric matrix has real eigenvalues - elementary proof

Another elementary proof, based on the order structure of symmetric matrices. Let me first recall the basic definitions and facts to avoid misunderstandings: we define $A\ge B$ iff $(A-B)x\cdot x\ge0$ …
Pietro Majer's user avatar
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53 votes
Accepted

A topologist is not a mathematician - a small question

It seems to me you are referring to Egbert Rudolf van Kampen (but the problem at the immigration office was quickly solved by a phone call to the university, the Johns Hopkins I believe). The story is …
Pietro Majer's user avatar
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10 votes

Negative impact of wrong or non-rigorous proofs

It has to be said that in the history of mathematics sometimes quite new profound ideas suddenly arise, so that tools, methods, and foundations are still lacking in a first phase of the new theory. T …
Pietro Majer's user avatar
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31 votes

Did ancient mathematicians know Euler's characteristic for convex polyhedra?

Today almost nobody shares anymore old Leibnitz' optimistic idea There is no ignorabimus in mathematics (in Hilbert's words). We know that there are true facts in mathematics that will never be prove …
Pietro Majer's user avatar
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