I'm interested in the rules set by the Chicago Manual of Style.
If I take a block quotation that starts with the following sentence:
"To simplify: math and geometry are such and such"
And if I leave out "To Simplify:" and start with the word math instead, do I have to indicate with ellipsis (...) that I've left out words at the beginning, like this:
... math and geometry are such and such
Or can I skip ellipsis? And if so, must I capitalize math with brackets, like this:
[M]ath and geometry are such and such
Or can I simply start my block quotation like this:
Math and geometry are such and such
I've consulted the two links below, but I don't know if the suggestions given there are also in accordance with the Chicago Manual of Style: