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

4 votes
1 answer
788 views

Who first introduced the notion of Killing vector field?

Does anybody know who that first introduced the notion of Killing vector field? Thanks.
C.F.G's user avatar
  • 4,195
30 votes
2 answers
5k views

What is the meaning of Text inside of AMS logo [closed]

What is the meaning of the text inside this AMS logo? The image is from here, and the logo seems to have been frequently used until the 80's. The text is ΑΓΕΩΜΕΤΡΗΤΟΣ ΜΗ ΕΙΣΙΤΩ but Google tra …
C.F.G's user avatar
  • 4,195
10 votes
1 answer
1k views

Why are faithful actions called faithful and who first called them faithful?

Sorry for this question. I asked this on MSE and HSM but no one answered and I decided to post it here that is full of experts. I want to know why are faithful actions called faithful and who first c …
C.F.G's user avatar
  • 4,195
2 votes

Geodesics on the sphere

I don't know that these are correct or not. The simplest way (in practice ) that come to my mind is the following trick. Consider two points $p$ and $q$ on sphere. connect them by an straight line …
C.F.G's user avatar
  • 4,195
4 votes

Video lectures of mathematics courses available online for free

30 lectures on Lie Groups, Representation theory and Symmetric Spaces by Wolfgang Ziller, UPenn 27 lectures on Algebraic Topology by Pierre Albin, University of Illinois 36 lectures on Topology & Geo …
7 votes

Most memorable titles

The book of Serge Lang: $\mathrm{SL}_2(\Bbb R)$. Lang, Serge, $\mathrm{SL}_2(\Bbb R)$, Reading, Mass. etc.: Addison-Wesley Publishing Company. XVI, 428 p. $19.50 (1975). ZBL0311.22001.