# Introduction to Linear Algebra:

## Sets.

Set is an unordered collection of objects, for example:
$$\{♠,♥,♦,♣\}$$

$\boldsymbol \in$ - this symbol means that an object belongs to a set(equivalently, that set contains an object). For example:
$$♥ \in \{ ♠,♥,♦,♣ \}$$

# Great books

### Catch Me If You Can by Frank Abagnale

I remember disliking the movie, but the book is brilliant and hilarious. Autobiography of one of the boldest, horniest, and most brilliant con artists.

### Ghost In The Wires by Kevin Mitnick

On the same topic, autobiography of a great hacker. Extremely clever ...