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This is a work in progress so we should cut the Khan Academy some slack. Even with that in mind, though, I'm seriously underwhelmed by the SAT prep materials up so far. I know their heart is in the right place, but from the skimpy selection to the low wattage instruction, there's just not that much here.I address the subject in more detail at the teaching site, You Do the Math, but I don't hit the bigger concern that I keep running into with these online learning ventures. As far as I can […]

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trigonometry-is-my-bitch:
Geometrical visualisation of a 4D shape from a 3D Perspective - The Tesseract
Hypercubes are shapes with n dimensions where n is greater than the 3 dimensions of a normal cube. The Tesseract, or the 4-cube, is a 4 dimensional hypercube.
where n is the dimensional number, in any hypercube:
vertices = 2^n
edges = n(2^n-1 )
faces = 2^n-3(n-1)n

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1809 = 3 x 3 x 3 x 67.1809 is the sum of the first 26 palindromes (A046489).1809 is the sum of the first 17 primes whose indices are primes (A083186).1809 is a non-palindromic balanced number; the first and last half of its digits have the same sum (A145808).1809 is a multiple of 9 that contains 9 in its decimal representation (A121029).1809 is 3421 in base 8. It is 809 in base 15.1809 divides 373 - 1.Source: OEIS

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Completamento del quadrato. Parabola e circonferenza. Spiegazione :lol: © 2014, Angelo Stella. All rights reserved.

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Laurent Duval just sent me the following:Dear IgorNuit Blanche is a nest of choice for many sparsities. The ones of concern here are those approximated by an $l_1/l_2$, or Taxicab/Euclidean norm ratio, which was already covered in some of your posts: http://nuit-blanche.blogspot.fr/2012/04/compressive-sensing-this-week.htmlhttp://nuit-blanche.blogspot.fr/2012/03/old-and-new-algorithm-for-blind.htmlhttp://nuit-blanche.blogspot.fr/2008/05/cs-kgg-explanation-of-l0-and-l1.html We propose
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j_lanier tweeted: @j_lanier

This hotel gets me. #tmc14 http://t.co/3KxeatZPSy

2014-07-24 13:07:34

mathfour tweeted: @mathfour

At first glance at @KateCrowder's artwork, I was horrified. Then I looked and understood. #grownupbaggage http://t.co/lQYWf2Jg55

2014-07-24 13:07:24

jamesgrime tweeted: @jamesgrime

@christianp Radcliffe is 25. In 1940 Turing was 28. He would be great.

2014-07-24 13:02:20

christianp tweeted: @christianp

@jamesgrime The Adventures of Young Alan Turing

2014-07-24 12:59:51

MrHonner tweeted: @MrHonner

RT @stevenstrogatz: Fascinating etymologies of math terms at http://t.co/Xs7jCSQGVp (e.g., "thousand" = "teue" + "hundt" = swollen hundred)

2014-07-24 12:59:35

MrHonner tweeted: @MrHonner

RT @tchmathculture: I posted a rant yesterday on @Storify in response to @elizwgreen's @nytimes math ed piece:
the case for slow reform. h…

2014-07-24 12:59:06

j_lanier tweeted: @j_lanier

Everything you tweet me makes me feel alive. #writesitself #tmc14

2014-07-24 12:51:04

MrHonner tweeted: @MrHonner

RT @mathbloggingeds: A world without statistics http://t.co/CCUHuRjCxO

2014-07-24 12:44:31

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