jonsen

64 ms·

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Perineuronal Nets Are Key for Long-Term Memory Recall(reliawire.com)
2 points by jonsen 9y ago|0 comments
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by jonsen 9y ago
Coincidentally I had just started speculating about the pedagogical merits of subtraction equivalence classes as an analog to fractions. Nice then to have it laid out by a mathematician. I think school algebra could benefit from a more anal
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by jonsen 9y ago
Automobile²
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by jonsen 9y ago
In this case it's not just mentioning. It's a twist of thought. This kind of comments can promote thinking outside conventional borders.
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by jonsen 9y ago
There's a phenomenon where I think you can sense the physical reality of complex numbers. When to propagating waves meet, and they are of opposite phase, they cancel out. At the meeting point the combined amplitude becomes zero. Despit
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by jonsen 9y ago
Well the article does mention: If beauty doesn't motivate you sufficiently, then take solace in the fact that the properties of some differential equations which arise in physics and engineering are determined by polynomials you can b
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by jonsen 9y ago
.. plan ahead and add open parentheses, or reorder, .. The classic example 3 + 4 7 + 8 ----- + ----- 5 + 6 9 + 2 Strait forward in RPN 3 ^ 4 + 5 ^ 6 + / 7 ^ 8 + 9 ^ 2 + / +
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by jonsen 9y ago
For me RPN is just the way a calculator should function. But I'm not shure I could explain why. Some of the explanation is ".. it gives you more insight into your calculations than using the ‘algebraic’ systems used by other cal
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by jonsen 9y ago
Great. Teach kids some rote manipulations. Things they will have forgotten if they later stumble upon some math. Or will have to relearn in college math. Will the same mistake happen with the learning to code in school movement? Or will the
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by jonsen 9y ago
Only if you are cornered.
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by jonsen 9y ago
I started with just GT. But getting things turned out to be severely addictive. Now I can't se how to be done with it.
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by jonsen 9y ago
There must be considerable unscertainty in calculating the human error rate after eight months of interplanetary travel.
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by jonsen 9y ago
Math is much more than what I was taught in school. I discovered that as a child when stumbling upon this Hungarian math book at the local library: https://www.amazon.com/Playing-Infinity-Dover-Books-Mathemat...
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by jonsen 9y ago
"His theoretical insights are grounded in an extended analysis of ship navigation—its computational basis, its historical roots, its social organization, and the details of its implementation in actual practice aboard large ships.&quot
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by jonsen 9y ago
Reminds me of Starting FORTH by Leo Brody. There's an online version: https://www.forth.com/starting-forth/
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How natural is numeracy?(aeon.co)
3 points by jonsen 9y ago|0 comments
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by jonsen 9y ago
Did you ever hear: "I love to code", "Writing code is so much fun" ? Software is not made by grownups. And for the most part the development is not managed by grownups. The problem is that so many can get away with child
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by jonsen 9y ago
I don't remember. Googling gave me these: http://educationnext.org/much-too-early/ https://www.education.com/magazine/article/higher-math-grade... https://www.psychologytoday.
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by jonsen 9y ago
You can't teach children proper mathematics. That's what's different. Children are not in general ready for math before 8'th or 9'th grade. That's why they are just pestered with arithmetic until the majority b
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by jonsen 9y ago
I think the preface tells.
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by jonsen 9y ago
And then a period with a lot of false positives.
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by jonsen 9y ago
This video lecture might interest you: http://techtv.mit.edu/videos/15895-an-electrical-engineering...
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by jonsen 9y ago
Don't worry about pushing up O2 all them airliners will suck it up.
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by jonsen 9y ago
Every programmer should know what they don't know.
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by jonsen 9y ago
I genuinely hate to go and measure my lumber but anyway I just did: Unplaned 2x5 measures exactly 2" x 5" Planed 2x3 measures 1 15/16" x 2 13/16" Planed 2x4 measures 1 7/8" x 3 3/4" I'm
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by jonsen 9y ago
A toy calculator? :p
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by jonsen 9y ago
( it’s slightly smaller if it is planed)
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by jonsen 9y ago
Also Brinch Hansen on Pascal Compilers : https://www.amazon.com/Brinch-Hansen-Pascal-Compilers/dp/013...
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by jonsen 9y ago
Someday someone might invent an efficient process for making gasoline from renewable energi sources.
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by jonsen 9y ago
Say you have an LED which can sustain 1 Watt of continuous power. If you feed it 10 Watt in fast pulses with a pulse/pause ratio of 1:9 it would still be 1 Watt on average, but the light intensity impression to the human eye would be h

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