==用語==
===集合===
----
====[https://cognicull.com/ja/xjqyb6pa 単射]====
====[https://cognicull.com/ja/rza89w28 全射]====
====[https://cognicull.com/ja/rza89w28 全単射]====
====[https://cognicull.com/ja/ajjl5h7n 直積]====
==[https://cognicull.com/ja/oczgnusb ベクトル]==