Linear Algebra - Lecture 25: One Sided Inverses and a Formula for 2x2 Inverses

[@jsmak7617]

Just a little remark pertaining to exercise 2.2.7 in the textbook: for n = 2 the condition a not = b is not sufficient for A to have an inverse - counter example: a = 1, b = -1

[@NathanielMath]

Thank you! I've added this to the book's errata file at njohnston.ca/la_errata.txt