James Tanton
@
jamestanton
Phoenix, AZ


An Aussie fellow promoting uplifting joyful genuine math thinking and doing for students & teachers alike. Honored: globalmathproject.org reaching millions!

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James Tanton
@jamestanton

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)


James Tanton
@jamestanton

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? pic.twitter.com/uFgjsH5D26


James Tanton retweeted  
One on Epsilon
@OneOnEpsilon

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. @jamestanton @GlobalMathProj
1onepsilon.com/singlepost/20…


James Tanton
@jamestanton

Aug 17  
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?


James Tanton
@jamestanton

Aug 17  
The jargon, context, and terminology has got me flummoxed! Can anyone explain what is being sought for here? twitter.com/B1GHuskers/sta…


James Tanton
@jamestanton

Aug 17  
Yesterday folk from Azerbaijan, Poland, Australia, US, and Nigeria signed up to take part in Global Math Week 2018 with #explodingdots. Joyous uplifting schoolrelevant mathematics is uniting the world. globalmathproject.org. @GlobalMathProj @Buzzmath @MIND_Research @NCTM


James Tanton
@jamestanton

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.) pic.twitter.com/H59S38UAVz


James Tanton
@jamestanton

Aug 17  
Wow! Thank you all! Here's the course from @TheGreatCourses thegreatcourses.com/courses/thepo…
Of course, lectures 6,7,8 are about #explodingdots. Check out gdaymath.com/courses/explod… too and please join the global phenomenon for globalmathproject.org. @GlobalMathProj @maanow @Buzzmath twitter.com/daniela8128/st…


James Tanton
@jamestanton

Aug 17  
Show that for each point inside a 345 right triangle with distances a, b, c shown the value of 3a + 4b + 5c is 12. pic.twitter.com/ywMXJbwvPS


James Tanton retweeted  
Jon Orr
@MrOrr_geek

Aug 15  
I can’t stop watching this... pic.twitter.com/qRkTGbHogo


James Tanton retweeted  
James Propp
@JimPropp

Aug 16  
There’s a doublyruled hyperboloid in the Museum of Mathematics that can be morphed into a cylinder. And you can watch it morph while sitting inside it! pic.twitter.com/HvjvOFNg0h


James Tanton
@jamestanton

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.)


James Tanton
@jamestanton

Aug 15  
Here's the story of #explodingdots for Global Math Week last year and why we're going for 10 million students GMW2018, Oct 1017. medium.com/@jamestanton/t… Will you join the global community for uplifting joyous mathematics? (globalmathproject.org.) @GlobalMathProj @Buzzmath


James Tanton retweeted  
Steven Strogatz
@stevenstrogatz

Aug 15  
The Mathematics of Folding a Fitted (Contour) Sheet  from highenergy Math Guy @jamestanton youtu.be/DEwConOQmWM via @YouTube


James Tanton
@jamestanton

Aug 15  
How to Fold a Fitted Sheet: youtube.com/watch?v=DEwCon… 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!) @GlobalMathProj


James Tanton
@jamestanton

Aug 15  
Here's the story of Piles & Holes (a precursor to the story of dots and antidots in #explodingdots) from Mindsets Learning @gomindsets ! mindsets.com/globalmathpr…
It's all part of the upcoming Global Math Week Oct 1017, but enjoy it now and always! @GlobalMathProj @Buzzmath


James Tanton
@jamestanton

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 #explodingdots. Learn about it here globalmathproject.org by clicking on 2017. Then gear up for Oct 1017 as it happens again by demand! @GlobalMathProj @Buzzmath


James Tanton
@jamestanton

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? pic.twitter.com/enpspzWi0s


James Tanton
@jamestanton

Aug 14  


James Tanton
@jamestanton

Aug 14  

