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Diffstat (limited to 'library/set.tex')
| -rw-r--r-- | library/set.tex | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/library/set.tex b/library/set.tex index 2fd18ea..69b9526 100644 --- a/library/set.tex +++ b/library/set.tex @@ -654,6 +654,9 @@ The $\operatorname{\textsf{cons}}$ operation is determined by the following axio Suppose $(A\inter B)\union C = A\inter (B\union C)$. Then $C\subseteq A$. \end{proposition} +\begin{proof} + Follows by \cref{union_upper_right,union_upper_left,subseteq_union_iff,subseteq_antisymmetric,subseteq_inter_iff}. +\end{proof} % From Isabelle/ZF equalities theory \begin{proposition}\label{union_inter_crazy} |