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1 I am trying to do this A and B are in different lines I know how to do it in terminal. mkdir 'A'$'n''B' How to do it in Nautilus? 18.04 nautilus filename share | improve this question asked Jan 15 at 7:42 JulianLai JulianLai 672 2 6 21 2 I would strongly recommend not to put line breaks in any file or directory names,

0 $begingroup$ Intuitively, I would think that if there exists a continuous mapping $f:Xrightarrow Y$ between 2 topological spaces $X$ and $Y$ , then the genus of $Y$ must be smaller that the Genus of $X$ (as during the mapping, holes in $X$ can be eliminated but no new holes may be made). However, I am finding it difficult to prove this formally. I was thinking of using the transformation of loops in $X$ to $Y$ by applying $f$ , but I cannot continue from this. As such, how can one prove this formally? proof-verification geometric-topology share | cite | improve this question asked Jan 5 at 7:26 Aryaman Gupta