Day 25 in Mat225

Last time: More on null and column spaces; bases

Next time: 4.5

Today:

No problems to return (sorry!).
Collect problems 4.1.
Questions/Comments on old stuff?
- Section 4.3:
  - section 4.3 summary
  - for #36, p. 245
Section 4.4:
- section 4.4 summary
- for #1, 5, 14, p. 253-4

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