I’m reminded of this part from HP:MoR when
Harry’s following Voldemort to what seems to be his doom.
Suppose, said that last remaining part, suppose we try to condition on the fact that we win this, or at least get out of this alive. If someone told you as a fact that you had survived, or even won, somehow made everything turn out okay, what would you think had happened—
Not legitimate procedure, whispered Ravenclaw, the universe doesn’t work like that, we’re just going to die
I never understood why this was considered illegitimate. If we have a particular desired outcome, it makes sense to me to envisage it and work backwards from there. Remaining open to deviations of course.
I’m out of my depth with mathematical and logical proofs, but wouldn’t this be just rhetorical engagement with a hypothetical. In probability theory we can use conditionals, this feels like doing that.