ãã®è¨äºã¯æ¥ææ°å¦ Advent Calendar 2020ã®14æ¥ç®ã®è¨äºã§ãã13æ¥ç®ã¯satoããã®ãççã®æ£®ã®æ°å¦ã»ããã¼ãSSï¼åå§ãã¿ã´ã©ã¹æ°ã®ã話ã§ããããã§ã«ãã¼ã®æçµå®çã¨åå§ãã¿ã´ã©ã¹æ°ã«ã¤ãã¦å¯¾è©±å½¢å¼ã§æ¸ããã¦ãã¦æ¥½ããèªããè¨äºã§ããã çªç¶ã§ãããèªç¶æ°ï¼ã«å¯¾ã㦠\begin{equation} mn = \gcd(m,n)\operatorname{lcm}(m,n)\label{1} \end{equation}ãæãç«ã¡ã¾ãã ä¸æ¹ãå®æ°ï¼ã«å¯¾ã㦠\begin{equation} x+y=\min\{x, y\} + \max\{x, y\}\label{2} \end{equation}ãæãç«ã¡ã¾ãã ã¾ããéåã®é¨åéåï¼ã«å¯¾ã㦠\begin{equation} \#(A+B) = \#( (A\cap B) + (A\cup B) ) \lab
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