修正关于集合基数的记号 #13
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Delete Branch "%!s()"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
如将 “#(A)” 改成 “card A”,以及将 “A,B 具有相同的基数” 简写成 “card A=card B”。