Charles Peirce ends the above tentative definition of the grounds for abduction by stating that “the effort should therefore be to make each hypothesis, which is practically no more than a question, as near an even bet as possible” (CP 1.121). The reason why I am quoting this passage of the Collected Papers is that I assume it can justify why should I (with no solid background in symbolic logic or mathematics) dare coming up with a debate on Paul Bourgine’s article “Models of abduction.” Taking the following rendition of an abductive inference as a guide: The surprising fact, C, is observed; But if A were true, C would be a matter of course, Hence, there is reason to suspect that A is true. (CP 5.189) I therefore decided to consider Paul’s ...