Housemate curious about the mathematics behind Spot It! for a while, so I was happy to point him at @joelgrus's post http://joelgrus.com/2015/06/12/on-the-mathematics-of-spot-it/ …
-
-
Replying to @St_Rev
Embarassed to say that I didn't realize it was a problem in finite projective geometry until seeing Joel's post. Kept thinking graph theory.
1 reply 1 retweet 0 likes -
Replying to @St_Rev
Anyway, housemate got about half of the idea from that post, then we spent a lovely evening going over the math by hand on the kids' easel.
1 reply 0 retweets 0 likes -
Replying to @St_Rev
Nice side effect for me is that I understand concretely & not just abstractly why you use spaces over Z/p and not arbitrary Z/n.
1 reply 0 retweets 1 like -
Replying to @St_Rev
Say n is composite = pq. Then the line y = px intersects the line y = 0 q times, and y = 1 never! (and projectivizing doesn't fix that).
1 reply 0 retweets 2 likes -
Replying to @St_Rev
oops, intersects p times I mean. i.e.: look at y = 3x mod 15. equals zero for x = 0, 5, 10.
1 reply 0 retweets 0 likes
OBVIOUSLY Rev why u so dum
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.
. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.