Logic Matters
@logicmatters.bsky.social
Recovering philosopher, but still interested in logic and abstract nonsense (and music). Occasionally blogs at logicmatters.net
It is out: it is amazing.
September 21, 2025 at 2:09 PM
It is out: it is amazing.
Yes! I agree! -- and Van Gogh particularly admired it too. www.logicmatters.net/2025/07/12/p...
Poetic serendipity - Logic Matters
I have written before about the pleasure of serendipitous finds in charity second-hand bookshops. It isn’t the matter of saving a few pounds (or of giving the money to a charity rather than a chain bo...
www.logicmatters.net
July 15, 2025 at 4:21 PM
Yes! I agree! -- and Van Gogh particularly admired it too. www.logicmatters.net/2025/07/12/p...
The gently-paced notes aim to be pretty accessible even if you have a relatively modest mathematical background. Could be useful prelim reading if you are taking an industrial strength course next term/semester. Or if you just want to get to know something about what the categorial fuss is about!
June 27, 2025 at 12:53 PM
The gently-paced notes aim to be pretty accessible even if you have a relatively modest mathematical background. Could be useful prelim reading if you are taking an industrial strength course next term/semester. Or if you just want to get to know something about what the categorial fuss is about!
They were simply amazing! And with their new violist have they ever sounded better?
June 24, 2025 at 5:19 PM
They were simply amazing! And with their new violist have they ever sounded better?
But that’s surely not a “trick” … it’s just applying about the most fundamental fact about triangles twice ….
June 21, 2025 at 6:35 PM
But that’s surely not a “trick” … it’s just applying about the most fundamental fact about triangles twice ….
Oops sorry I missed your earlier post!
June 21, 2025 at 6:32 PM
Oops sorry I missed your earlier post!
It’s quite trivial. No pythagoras or Cartesian coordinates needed.
Move top apex to bottom right of big square, and area stays the same (why?). Now move bottom apex to bottom right of middle square, and area still stays the same. But you’ve ended up with triangle half the middle square so area 10.
Move top apex to bottom right of big square, and area stays the same (why?). Now move bottom apex to bottom right of middle square, and area still stays the same. But you’ve ended up with triangle half the middle square so area 10.
June 21, 2025 at 6:22 PM
It’s quite trivial. No pythagoras or Cartesian coordinates needed.
Move top apex to bottom right of big square, and area stays the same (why?). Now move bottom apex to bottom right of middle square, and area still stays the same. But you’ve ended up with triangle half the middle square so area 10.
Move top apex to bottom right of big square, and area stays the same (why?). Now move bottom apex to bottom right of middle square, and area still stays the same. But you’ve ended up with triangle half the middle square so area 10.
Arnie Koslow used to say that the talk of “scaffolding” that we supposedly find e.g. in Hilbert is a mistranslation… and the reference was to the wooden frames of old houses (not temporary at all!).
May 21, 2025 at 12:50 PM
Arnie Koslow used to say that the talk of “scaffolding” that we supposedly find e.g. in Hilbert is a mistranslation… and the reference was to the wooden frames of old houses (not temporary at all!).