I don't think there's any built-in way, because self-deletions are not listed in the "recently deleted" section of either the 10k+ or the moderator tools. However, by googling things like "math stack commutative algebra" with the results restricted to the past 24 hours, I found one question with negative score that had been deleted, and then knowing the user name, googled "math stack algebra <user name>" to find the other one. Presumably these are the ones you're thinking of?

• Property of an edge ideal

• Rees algebra of a monomial ideal

Another approach would be to go through one's browser history (though since I didn't go to these pages before this wasn't an option for me).

I don't think there's any built-in way, because self-deletions are not listed in the "recently deleted" section of either the 10k+ or the moderator tools. However, by googling things like "math stack commutative algebra" with the results restricted to the past 24 hours, I found one question with negative score that had been deleted, and then knowing the user name, googled "math stack algebra <user name>" to find the other one. Presumably these are the ones you're thinking of?

• Property of an edge ideal

• Rees algebra of a monomial ideal

Another approach would be to go through one's browser history (though since I didn't go to these pages before this wasn't an option for me).