What is A\A? - Cleve Moler on Mathematics and Computing
 

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The answer: A\A is always I, except when it isn't.

Contents[URL="https://www.labfans.com/bbs/#ae338b95-f89b-4634-bbe2-add19f0fa92f"]Why A\A ?[/URL][URL="https://www.labfans.com/bbs/#44882ad7-ebee-4871-946c-baab21cc1e31"]Mono-elemental matrices[/URL][URL="https://www.labfans.com/bbs/#d6de032f-e1da-47b9-8f08-4bf7acd2eeaa"]Nonsingular matrices[/URL][URL="https://www.labfans.com/bbs/#0152d18e-8c8d-4aa0-802c-1fe3807f3033"]Mono-elemental again[/URL][URL="https://www.labfans.com/bbs/#38c52489-7db2-4ba0-ad0c-156111d7643f"]Rank deficient matrices[/URL][URL="https://www.labfans.com/bbs/#2e31bb2c-7c65-45ae-8d75-a1fecebbf576"]Lots of NaNs[/URL][URL="https://www.labfans.com/bbs/#c49fe7ce-b9fb-45da-8af6-e6842166dd89"]Magic squares[/URL][URL="https://www.labfans.com/bbs/#09b5c1de-53f5-47ed-b21b-270fe66f6aea"]Odd[/URL][URL="https://www.labfans.com/bbs/#fee1eea4-2f6d-4eac-aad6-c4941db49733"]Singly even[/URL][URL="https://www.labfans.com/bbs/#91e4c282-d92b-4198-9b30-0120fb80694a"]Doubly even[/URL][URL="https://www.labfans.com/bbs/#ba1706d3-0349-427a-bdec-9a4c6b6a59f9"]Pseudoinverse[/URL][URL="https://www.labfans.com/bbs/#5d730b9c-864f-4f18-8aac-f7fb5c2cd06b"]My Bottom Line[/URL]Why A\A ?I have been explaining our backslash operator for almost 50 years, but I



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