Category Archives: Logic

Frege on “if”

I’ve been looking at the passage early in the Begriffsschrift where Frege introduces the material conditional — not, of course, using that label, and not of course with our notation. He notes that can be affirmed when A is denied or when … Continue reading

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Teach Yourself Logic 2017

The Teach Yourself Logic 2016 Study Guide was viewed an astonishing 51K times and download 3K times from my academia.edu page last year. It was also downloaded another 1.4K times from this Logic Matters site. I guess (or at least, hope!) … Continue reading

Posted in Logic, TYL | 3 Comments

The material conditional and the logic textbooks (3)

So turning to Nick Smith’s long and discursive book, what line does he take on the relationship between everyday conditionals and the material conditional? Smith, as usual, sets aside subjunctive conditionals; the issue then is the relation beween indicative conditional … Continue reading

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The material conditional and the logic textbooks (2)

Continuing from the previous post, I’ll consider five elementary textbooks aimed at philosophers, all either first published, or with new editions, well after e.g. Edgington’s State of the Art article. The first three texts I’ve chosen to look at because … Continue reading

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Tarski on disjunction

Before going off to Florence, I was reworking chapters on the material conditional for IFL2 (in fact I posted a couple of draft chapters here, which I then thought I could improve on,  and so I rapidly took them down again). While away, … Continue reading

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Logic (etc.) books of the year?

It’s that time again when the weekend papers are full of their lists of books of the year.  I have to say that so many recommendations sound frankly quite unappealing — surely, there’s a lot of literary virtue-signalling going on! —  but that still … Continue reading

Posted in Books, Logic | 8 Comments

The material conditional — analysis or replacement?

Update. I posted a couple of chapters, just 22 pages, hot off the laptop, from a bit later in the draft second edition of my Intro to Formal Logic about the material conditional. I’m now a little unhappy with them, … Continue reading

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Unsatisfying satisficing

There’s no getting away from it. You know perfectly well you can’t try to optimize a book — that way madness lies (or at least, never finishing). You know perfectly well you have to satisfice. But that is oh so … Continue reading

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Plural Logic, again

A second, paperback, edition of Plural Logic by Alex Oliver and Timothy Smiley is now out from OUP. As the cover says, it is ‘Revised and Enlarged’ – in fact it is almost fifty pages longer, with some new sections and … Continue reading

Posted in Category theory, Logic | 1 Comment

The Greeks win (2)

On the question of metavariables — relaxed italics versus Greek letters. Which do you prefer? Those who voted in the poll  (and too late, I realized I should have had added a  “really don’t care” option), preferred Greek letters by 4 … Continue reading

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