Week 1 | Lesson 3 | What do we need to know about matrices?

0:00 Recap of last video
0:58 Dimensions of a matrix (definition)
1:56 Leading entries (definition)
3:11 Classifying matrices
5:22 Echelon form (definition)
8:28 Three rules of Echelon form
12:34 Row Reduced Echelon Form (definition)
12:46 Two more rules for RREF
16:50 Pivots
17:35 Pivot columns
20:45 Row operations for matrix manipulation
23:31 Going from Echelon to RREF (example)
30:17 Why do we like RREF?
31:14 Row equivalent matrices (definition)