Wasn't Popper a falsificationist? Then why did he try to develop ideas about corroboration and versimilitude - the extent to which a theory was closer to truth than another theory? Isn't this verging dangerously close to verificationist territory?

In our fourth ep on Chapter 10 in C&R, we wrestle with Popper's treatment of verisimilutude, both the formal and informal versions. Did the project fail? Was Popper out of his mind? Does this invalidate everything?

We discuss

• Murders with ball-peen hammers
• Walking the line between verification and falsification
• Is science only after truth?
• Verisimilutude and its formalization
• Why the formalization fails
• Popper's three requirements for the growth of knowledge
• Popper's ratchet and the no ad-hoc rule

Quotes

Like many other philosophers I am at times inclined to classify philosophers as belonging to two main groups—those with whom I disagree, and those who agree with me.
- C&R, page 309

I shall give here a somewhat unsystematic list of six types of cases in which we should be inclined to say of a theory t1 that it is superseded by t2 in the sense that t2 seems—as far as we know—to correspond better to the facts than t1 , in some sense or other.

• t2 makes more precise assertions than t1 , and these more precise assertions stand up to more precise tests.
• t2 takes account of, and explains, more facts than t1 (which will include for example the above case that, other things being equal, t2 ’s assertions are more precise).
• t2 describes, or explains, the facts in more detail than t1 .
• t2 has passed tests which t 1 has failed to pass.
• t2 has suggested new experimental tests, not considered before t 2 was designed (and not suggested by t1 , and perhaps not even applicable to t1 ); and t 2 has passed these tests.
• t2 has unified or connected various hitherto unrelated problems.

- C&R, page 315

Let me first say that I do not suggest that the explicit introduction of the idea of verisimilitude will lead to any changes in the theory of method. On the contrary, I think that my theory of testability or corroboration by empirical tests is the proper methodological counterpart to this new metalogical idea. The only improvement is one of clarification.
- C&R, page 318

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