🆕 standupmaths: Why do whole oranges float, but peeled oranges sink?
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Why do whole oranges float, but peeled oranges sink?
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Here is the original QI tweet:
"A whole orange…
https://brilliant.org/standupmaths
Be one of the first n people (for n = 200) to sign-up for a free Brilliant account and get 20% off if you upgrade to paid membership.
Here is the original QI tweet:
"A whole orange…
🆕 Mathologer: Epicycles, complex Fourier and Homer Simpson's orbit
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Epicycles, complex Fourier series and Homer Simpson's orbit
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Today’s video was motivated by an amazing animation of a picture of Homer…
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Today’s video was motivated by an amazing animation of a picture of Homer…
🆕 blackpenredpen: Nice proof, differentiability implies continuity
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Proving differentiability implies continuity
We will discuss a calculus proof that differentiability implies continuity! If a function is differentiable at some point a, then it is continuous at that point. It means differentiable functions have to be continuous! But the converse of this isn't always…
🆕 Dr. Peyam's Show: A linear algebra integral
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A linear algebra integral
In this video I integrate e^(ax)cos(bx) without using integration by parts or complex analysis, but instead using pure linear algebra. This is probably not the most efficient method, but it provides an illustration of how linear algebra makes everything neater.…
🆕 standupmaths: Can animals predict the future? Meet Barry the Psychic Labrador!
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Can animals predict the future? Meet Barry the Psychic Labrador!
Barry the Psychic Labrador has predicted an England win: https://psychic-pets.com/pets/232 Lilo the Psychic Basset Hound has predicted a Sweden win: https://...
Forwarded from Today I Learned 🎓
TIL that the "division symbol" is actually named the "Obelus", and that the ISO standard for mathematical signs says that it "should not be used" for division. [Source]
Today I Learned 🎓
TIL that the "division symbol" is actually named the "Obelus", and that the ISO standard for mathematical signs says that it "should not be used" for division. [Source]
Wikipedia
Obelus
division sign (U+00F7), obelus, or obell: mathematical operator; rating marker sometimes used as a hyphen variant, differentiated in some contexts; old punctuation mark to indicate questionable passages in manuscripts
🆕 blackpenredpen: Pythagorean Triple Formulas
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finding ALL pythagorean triples (solutions to a^2+b^2=c^2)
How to generate ALL the Pythagorean Triples, namely a^2+b^2=c^2 where a, b, c, are whole numbers? Here we will find all the solutions to a^2+b^2=c^2. This is a very classic number theory question and it is very suitable for high school algebra and geometry…
🆕 MindYourDecisions: Can You Figure Out The Special 6 Digit Number?
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Can You Figure Out The Special 6 Digit Number?
A 6 digit number abcdef has the following property. Make a table with 6 rows, where column i = 1, 2, 3, 4, 5, 6 is the number abcdef multiplied by i. (If the first row was 123456, the second row would be 123456 x 2 = 246912). The result is a Latin square:…