Let me summarize the changes I have made.
I first fixed some typos by removing a word from two sentences:
"A lemma is a proposition or theorem that is used to in the proof of a more important result."
and
"A statement to be proved often contains some assumption that clarifies about which kinds of things we're proving something."
Then I fixed an equation in subsection 2.6 with the details in the ... right next to that change.
As far as I am aware, this should be merged now. Let me know if there's anything I need to fix here. Information on the changes can be seen with the ellipses.
Let me summarize the changes I have made. I first fixed some typos by removing a word from two sentences: "A lemma is a proposition or theorem that is used
toin the proof of a more important result." and "A statement to be proved often contains some assumption that clarifies about which kinds of things we're provingsomething."Then I fixed an equation in subsection 2.6 with the details in the ... right next to that change.