I have seen that range $A^*$ = $(\text{null }A)^\perp$, for example here. And I have seen that $(\text{null A})^\perp$ = row $A$, for example here. Does it therefore follow that range $A^*$ = row $A$? I haven't seen this written anywhere, and it seems like such a simple relationship that, if it were true, it would pop up on the internet somewhere. So what am I missing? Or is it just true?
2026-03-31 21:10:51.1774991451
Column space of $A^*$ is row space of $A$?
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