[frankling_]

Your statement is obviously false (counter example: analytic philosophy produces conjectures that are black-or-white-falsifiable on the exact same basis as mathematical conjectures). Since you are engaging in epistemology, you may appreciate that the above is also an example of what falsification looks like when it is not formal. I'd suggest reading some Popper.

[brownbat]

Seconded. I'd add Wittgenstein and Quine to the list.

Two Dogmas would be a good place to end up.