In geometry, a demienneract or 9-demicube is a uniform 9-polytope, constructed from the 9-cube, with alternated vertices removed. It is part of a dimensionally infinite family of uniform polytopes called demihypercubes. E. L. Elte identified it in 1912 as a semiregular polytope, labeling it as HM9 for a 9-dimensional half measure polytope. Coxeter named this polytope as 161 from its Coxeter diagram, with a ring onone of the 1-length branches, and Schläfli symbol or {3,36,1}. (Wikipedia).

Ignite Boston 9: Doug Sweetser

Quaternions, THE Numbers of the Universe

From playlist Ignite Boston 9

From playlist OpenAI Five (Dota 2)

1,010,010,101,000,011 - #MegaFavNumbers

This is my submission to the #megafavnumbers project. My number is 1010010101000011, which is prime in bases 2, 3, 4, 5, 6 and 10. I've open-sourced my code: https://bitbucket.org/Bip901/multibase-primes Clarification: by "ignoring 1" I mean ignoring base 1, since this number cannot be fo

From playlist MegaFavNumbers

CityVideoFINAL 5-30-11_ youtube

From playlist AMATYC New Orleans Videos

MegaFavNumbers: Plus One Primes, 154,641,337, and 62,784,382,823

My entry in the #MegaFavNumbers series looks at a particularly striking example of a very specific family of primes -- and how it connects to what digits can be the final digit of primes in different bases.

From playlist MegaFavNumbers

This Problem Stumped Vietnamese Students - Solution To Viral Puzzler

This problem was asked to students in Vietnam. Can you figure it out? Place the numbers 1 to 9, using each number once, to make a valid equation. In this video I explain how you can solve this problem logically. UPDATE: I've posted all 136 solutions, at the end of this description, found

From playlist Viral Math Memes

Between 1&9 Sudoku AKA "Sandwich Sudoku"!

Simon takes a look at this outstanding puzzle created by one of our viewers, thank you Isaac Resnikoff. We're also delighted to note that Alex Bellos, author of some brilliant puzzle books (like Alex's Adventures In Numberland), has written an article about our channel and this Sudoku var

From playlist "Sandwich Sudoku"/Between 1&9 Sudoku

Decomposing a fraction visually | Fractions | Pre-Algebra | Khan Academy

It helps to visually understand what decomposing a fraction looks like. We're pretty sure you're going to like this. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/decomposing-fractions-pre-alg/e/decomposing-fract

From playlist Fractions | Pre-Algebra | Khan Academy

This video shows three reasons why 0.9999… equals 1.

From playlist Mathematics General Interest

In what sense is sum 9 + 90 + 900 + ... meaningful? - Week 2 - Lecture 13 - Sequences and Series

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From playlist Ohio State: Calculus Two with Jim Fowler: Sequences and Series | CosmoLearning Mathematics

EngageNY Grade 3 Module 3 Lesson 13

EngageNY/Eureka Math Grade 3 Module 3 Lesson 13 For more videos, please visit http://bit.ly/engageportal

From playlist EngageNY Grade 3 Module 3

Sum & Product of Cosines (3 of 3: Drawing ℝ conclusions)

More resources available at www.misterwootube.com

From playlist Using Complex Numbers

Write and Determine a Difference Describing an Situation

This video explains how to write and determine a difference to solve an application. The difference is determined on the number line and formally. http://mathispower4u.com

From playlist Adding and Subtracting Integers

A sudoku with only 3 givens? How is that even possible?

An elegant variant sudoku from the UK Open Sudoku tournament. This is called "Between 1 & 9" sudoku

From playlist "Sandwich Sudoku"/Between 1&9 Sudoku

EngageNY Grade 3 Module 3 Lesson 14

EngageNY/Eureka Math Grade 3 Module 3 Lesson 14 For more videos, please visit http://bit.ly/engageportal

From playlist EngageNY Grade 3 Module 3