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| -rw-r--r-- | library/relation.tex | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/library/relation.tex b/library/relation.tex index b5aebcd..4c4065f 100644 --- a/library/relation.tex +++ b/library/relation.tex @@ -422,6 +422,9 @@ \begin{proposition}\label{fld_cons} $\fld{(\cons{(a,b)}{R})} = \cons{a}{\cons{b}{\fld{R}}}$. \end{proposition} +\begin{proof} + Follows by set extensionality. +\end{proof} \begin{proposition}\label{fld_union} $\fld{(A\union B)} = \fld{A}\union\fld{B}$. |