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10) "The proof of this theorem is omitted because it's trivial." (And then it takes two hours and several pages to figure it out.)
9) "Refer to Theorem 6.6.4." (And there's no Theorem 6.6.4 in the book.)
8) "Here we apply X's Theorem." (And X gave his name to about 15 theorems, none of which have been mentioned in the book before.)
7) (From notes.) "Lesson was not clear, see the book for this part." (And it's not in the book.)
6) "Let's call this variable X. Then let's change our mind and call it Y. Then let's call this other variable X."
5) Anything involving apices, pedices and indicized variables. Especially if the end result is something like (x(i)_l)^j.
4) Especially when there is a mistake in the text. (And there always is.)
3) Russian mathematicians whose name is spelled in 3 different ways in as many times they're mentioned. (And they never show up on Wikipedia or Google either.)
2) Anything that mentions differential forms.
1) Studying, in general.
9) "Refer to Theorem 6.6.4." (And there's no Theorem 6.6.4 in the book.)
8) "Here we apply X's Theorem." (And X gave his name to about 15 theorems, none of which have been mentioned in the book before.)
7) (From notes.) "Lesson was not clear, see the book for this part." (And it's not in the book.)
6) "Let's call this variable X. Then let's change our mind and call it Y. Then let's call this other variable X."
5) Anything involving apices, pedices and indicized variables. Especially if the end result is something like (x(i)_l)^j.
4) Especially when there is a mistake in the text. (And there always is.)
3) Russian mathematicians whose name is spelled in 3 different ways in as many times they're mentioned. (And they never show up on Wikipedia or Google either.)
2) Anything that mentions differential forms.
1) Studying, in general.
