A passage from [[Karl Popper]] about how he distinguishes between [[falsifiability]] and [[falsification]].
Popper's "falsification" seems related to [[Imre Lakatos]]'s notion that a [[research programme]] has a [[hard core]]
of central theses that are deemed irrefutable—or, at least, refutation-resistant—by methodological fiat. (Musgrave & Pigden 2021, SEP article linked below)
Also, what Popper calls "falsifiable"/"falsifiability" is similar to Lakatos's
[[protective belt]] of [[auxiliary hypotheses]] which has to bear the brunt of tests and gets adjusted and re-adjusted, or even completely replaced, to defend the thus-hardened core. (FMSRP: 48)
[[Falsification and the Methodology of Scientific Research Programmes]]
There's seems to be a curious reversal between Popper & Lakatos. The theoretical component for Lakatos (ie, the "hard core") can't be falsified, whereas the theoretical component for Popper (ie, something being "falsifiable in principle") is a
purely logical concept … [that] rests on a logical relation between the theory in question and the class of basic statements (or the potential falsifiers described by them). (Popper 1982, from passage above)
A crucial difference between Lakatos & Popper is that for Lakatos
A research programme can be falsifiable (in some senses) but unscientific and scientific but unfalsifiable. (Musgrave & Pigden 2021, SEP article linked below)
This seems in direct conflict with one of Popper's views that falsifiability can serve as a [[demarcation criterion]] for what is scientific and non-scientific.
Cf. 2.2 of "Imre Lakatos" on SEP