Discussion on question by Graviton: How to rigorously prove that $|A|\neq|A\cup B|$, when $B\not\subseteq A$ and $A$ is finite.
Discussion on question by Graviton: How to rigorously prove that $|A|\neq|A\cup B|$, when $B\not\subseteq A$ and $A$ is finite.
Imported from a comment discussion on https://math.stackexchange.com/questions/4228501/how-to-rigorously-prove-that-a-neqa-cup-b-when-b-not-subseteq-a-and-a
| first message | 2021-08-21 |
| last message | 1266 days ago |
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