This paper talks about "$M^\natural$-concave functions". The paper defines what an M$^\natural$-concave function is, but, I would like to know specifically what does the $\natural$ symbol mean? Why is it called "natural" and where else in mathematics is it used?
Asked
Active
Viewed 679 times
5
-
1See Natural sign (in music). – Mauro ALLEGRANZA Sep 29 '16 at 05:55
-
This post on TeX.SE implies that the OP was wishing to use it as a boundary connected sum in analogy to how $\sum$ is used for ordinary summation. Looking at other texts about boundary connected sums however, I see $#$ or some other variation being used instead. – JMoravitz Sep 29 '16 at 06:33
-
Should we read for example M natural? – haleh May 27 '17 at 08:30
-
It's the natural sign from music, to undo a sharp or flat set by the key signature. Unsure how it's used in math. Here's the Unicode for the symbol: http://www.fileformat.info/info/unicode/char/266e/index.htm – 2540625 Jul 04 '19 at 03:44