# Difference between revisions of "12-240/Classnotes for Thursday September 20"

From Drorbn

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== Complex number == | == Complex number == | ||

+ | '''Definition:''' | ||

+ | |||

''' C'''={(a,b): a, b <math>\in\!\,</math> '''R'''} | ''' C'''={(a,b): a, b <math>\in\!\,</math> '''R'''} | ||

+ | |||

+ | I ( of '''C''') = (1,0); 0 ( of '''C''')= (0,0) | ||

[[Image:IMG.jpg]] | [[Image:IMG.jpg]] | ||

[[Image:IMG2.jpg]] | [[Image:IMG2.jpg]] | ||

[[Image:IMG3.jpg]] | [[Image:IMG3.jpg]] |

## Revision as of 11:29, 21 September 2012

In this class, the professor completes the lecture about complex number and then introduces vector space.

## Complex number

**Definition:**

** C**={(a,b): a, b **R**}

I ( of **C**) = (1,0); 0 ( of **C**)= (0,0)
File:IMG.jpg
File:IMG2.jpg
File:IMG3.jpg