Fix typos in chapter about filtrations in modal logic

OpenLogicProject / OpenLogic

An open-source, customizable intermediate logic textbook

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Closed Columbus240 closed 1 year ago

Columbus240 commented 1 year ago

Another student pointed out these typos to me.

Points in a filtration are equivalence classes. And in some places, the brackets that mark the equivalence class were missing.
Once the wrong variable is used. (u does not even appear in this proof)
Finally, the parts of a model are introduced with a non-conventional variable.

rzach commented 1 year ago

Thanks!