- What is the vector?
- How to sum(multiply) vectors ## Description
- Vector is the main components of Linear Algebra
- What exactly vector is?
- three distinct ideas
- Physics
- Vectors are arrows pointing in space
- Two Elements
- length
- direction
- regardless starting point
- Computer Science
- order list of number
- Mathematicsian
- In this video
- think vector as arrow from origin
- think arrows and list alternately(It dosen't matter how we think between them cause it can be alternative each other)
- **Summation**
- Think vector A and vector B.
- we can think A+B as new vector
- move B's starting point to A's end point. and draw new vector that start from A's starting point to B's end point
- **Multiplication**
- Think vector A and scala B
- if B is positive, then squeeze or expand A by B
- if B is negative then A is flipped based on starting point and squeezed or expanded ## Next Step - Linear combinations, span and bases