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### Intro to hyperbolic trigonometric functions : Hyperbolic Trig Func...

##### By: Sal Khan

Exploring a motivation for even defining hyperbolic sine and cosine

Motivation and understanding of hyperbolic trig functions.

### Brain Teasers : Toggler Brain Teaser

##### By: Sal Khan

Separating the truthteller from the togglers!

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Forehead Numbers Brain Teaser

##### By: Sal Khan

The perfect logicians are at it again.

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Light Bulb Switching Brain Teaser

##### By: Sal Khan

Turning light bulbs on and off.

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Blue Forehead Room Solution

##### By: Sal Khan

Do not watch before Blue Forehead Room. THIS IS THE SOLUTION!

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : 3-D Path Counting Brain Teaser

##### By: Sal Khan

Extending the path counting to three dimensions

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Alien Abduction Brain Teaser

##### By: Sal Khan

Saving Earth from becoming a mushroom farm.

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Blue Forehead Room Brain Teaser

##### By: Sal Khan

What happens when 100 perfect logicians have to figure out if they each have a blue forehead?

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Liar Truth-teller Brain Teaser

##### By: Sal Khan

How to get correct advice when you can only ask one question from either a liar or a truth-teller (when you don't know who is what)

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Brain Teasers : Path Counting Brain Teaser

##### By: Sal Khan

Counting paths in a square

Random logic puzzles and brain teasers. Fun to do and useful for many job interviews!

### Computational Number Theory : Primality Test

##### By: Brit Cruise

Setting up the problem of a primality test

The branches of mathematics that are involved in the study of the physical or biological or sociological world.

### Arithmetic properties : Associative Law of Addition

##### By: Sal Khan, Monterey Institute for Technology and Education

Associative Law of Addition

Putting names to properties of common arithmetic operations. The first math topic. Start here if you want to learn the basics (or just want to make sure you know these topics). After this, you should be ready for algebra. This topic includes videos from t

### Scattering Matrices for Ionosphere Models

##### By: Russek, A

Sloan Foundation ; New York University, Institute of Fine Arts Library

### Non-Linear Deflections of Shallow Spherical Shells

##### By: Reiss, Edward L; Greenberg, Herbert J
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