The space of sections of a bundle $\pi: E \to B$ is commonly denoted $\Gamma(E)$. (Note that the graph of a function $f$ is $\Gamma(f):=\left\{(x,f(x))\right\}$, and a particular section $\sigma: B \to E$ "is" a graph $\left\{(b,\sigma(b)) : b \in B\right\}$; but it is the space of all such objects that is called $\Gamma(E)$. I find this a bit confusing, etymologically.) If knowable, what is the reason for this letter (and where and by whom was this notation introduced)?
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$\begingroup$ Maybe it stands for "global" sections? $\endgroup$– WatsonJul 22, 2017 at 19:10
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$\begingroup$ Possibly related on MSE : math.stackexchange.com/questions/2213116, math.stackexchange.com/questions/1349424. $\endgroup$– WatsonJul 22, 2017 at 19:18
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