Typo in Lindenbaum's lemma proof

[marethyu]

The most convenient way to report a typo should reference the file and line number where the typo occurs:

• Find the file in the content tree: https://github.com/OpenLogicProject/OpenLogic/tree/master/content
• Click on the line number; then on the menu indicated by three horizontal dots
• Select "Copy permalink" and paste that link below.

Alternatively describe the location of the typo (page #, "after Theorem 5.1", etc., and mention which PDF you are referencing)

Typo location:

pg. 232

What is the typo:

In the last sentence of the third paragraph in the proof of Lindenbaum's lemma, I believe \subseteq\Gamma_{n+1} should be \Gamma_i\subseteq\Gamma_{n+1}.

[rzach]

Thanks!