[Lecture 1] More information about vector spaces.
[Lecture 1] Grammar, small fixes, yofication.
[Lecture 1] Add small note about countable sets.
[Lecture 1] Cauchy sequence.
[Lecture 1] Small changes.
Merge pull request #3 from Melkogotto/master

Пунктуация, ёфикация, небольшие дополнения