Twitter | Search | |
James Tanton
An Aussie fellow promoting uplifting joyful genuine math thinking and doing for students & teachers alike. Honored: reaching millions!
11,419
Tweets
1,000
Following
14,493
Followers
Tweets
James Tanton Aug 20
A convex polygon has the property that for each point inside the figure the sum of its distances to each side (extending side lengths if necessary) is the same fixed value. Must the polygon possess rotational symmetry of some degree? (eg This is a true property of all reg polys)
Reply Retweet Like
James Tanton Aug 18
A convex quadrilateral has the property that for each point inside the figure the sum of its distances from each side (maybe extend a side length) is the same fixed value. Must the quadrilateral be a parallelogram?
Reply Retweet Like
James Tanton retweeted
One on Epsilon Aug 18
Towards the 2018 Global Math Week ask: Is mathematics discovered or invented? Clara Valtorta's recent Curious Epsilon post collects insights from a variety of educators and scholars pondering about this classic question.
Reply Retweet Like
James Tanton Aug 17
Replying to @SeanRumrill
Hope I said in guide that matters might still require tricky thinking! If were 11 people & committees of 2, 5, 4 then labeling fine: get 11!/2!5!4! But the two 5s make the labels hard. If you could distinguish the two 5s then get:12!/2!5!5!. But that ans not right. So how adjust?
Reply Retweet Like
James Tanton Aug 17
The jargon, context, and terminology has got me flummoxed! Can anyone explain what is being sought for here?
Reply Retweet Like
James Tanton Aug 17
Yesterday folk from Azerbaijan, Poland, Australia, US, and Nigeria signed up to take part in Global Math Week 2018 with . Joyous uplifting school-relevant mathematics is uniting the world. .
Reply Retweet Like
James Tanton Aug 17
(Having fun pushing Viviani Thm to the max!) A triangle has the property that for each point inside the triangle the sum of the three distances shown, a+b+c, has the same fixed value. Must the triangle be equilateral? (Bonus: Find a triangle for which a+b+2c is a fixed value.)
Reply Retweet Like
James Tanton Aug 17
Wow! Thank you all! Here's the course from Of course, lectures 6,7,8 are about . Check out too and please join the global phenomenon for .
Reply Retweet Like
James Tanton Aug 17
Show that for each point inside a 3-4-5 right triangle with distances a, b, c shown the value of 3a + 4b + 5c is 12.
Reply Retweet Like
James Tanton retweeted
Jon Orr Aug 15
I can’t stop watching this...
Reply Retweet Like
James Tanton retweeted
James Propp Aug 16
Replying to @stevenstrogatz
There’s a doubly-ruled hyperboloid in the Museum of Mathematics that can be morphed into a cylinder. And you can watch it morph while sitting inside it!
Reply Retweet Like
James Tanton Aug 16
Classic: Prove that if a convex polygon has rotational symmetry of any degree (eg 60 deg symm, 180 deg symm, etc), then for a point inside the polygon the sum of its distances to each side of the polygon is a fixed predetermined value. (Viviani = 60 deg symmetry.)
Reply Retweet Like
James Tanton Aug 15
Here's the story of for Global Math Week last year and why we're going for 10 million students GMW2018, Oct 10-17. Will you join the global community for uplifting joyous mathematics? (.)
Reply Retweet Like
James Tanton retweeted
Steven Strogatz Aug 15
The Mathematics of Folding a Fitted (Contour) Sheet - from high-energy Math Guy via
Reply Retweet Like
James Tanton Aug 15
How to Fold a Fitted Sheet: For those for whom this is an issue it is a big deal. For those who don't care, this is all a moot. But I am still getting loads of emails about this video! (Lots of people care!)
Reply Retweet Like
James Tanton Aug 15
Here's the story of Piles & Holes (a pre-cursor to the story of dots and antidots in ) from Mindsets Learning ! It's all part of the upcoming Global Math Week Oct 10-17, but enjoy it now and always!
Reply Retweet Like
James Tanton Aug 15
Last yr 1.77M Ts & Ss across the globe took part in Global Math Week, a global community of math joy & wonder with . Learn about it here by clicking on 2017. Then gear up for Oct 10-17 as it happens again by demand!
Reply Retweet Like
James Tanton Aug 15
A small equilateral triangle moves about inside a large one while maintaining its orientation to match that of the large one. What can you say about the sum of distances a+b+c shown? Anything to be said about d+e+f?
Reply Retweet Like
James Tanton Aug 14
This is right above my and heads! ( )
Reply Retweet Like
James Tanton Aug 14
A swirling vortex of AZ monsoon clouds!
Reply Retweet Like