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Cake day: June 27th, 2023

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  • Carnelian@lemmy.worldtoLemmy Shitpost@lemmy.worldRAMANUJAN SPECIAL
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    15 days ago

    Sadly the sum of all natural numbers is not actually -1/12. It’s a divergent sum. You could call it infinity.

    There’s a little parlor trick that maths teachers like to perform where they do algebraic manipulation on a simple formula, eventually cancelling out the variables and arriving at some absurd statement like 1=2. The game is for the students to figure out what went wrong.

    The trick is always that at some point, snuck into the progression, you ended up dividing something by “(X-X)” before moving on, seemingly without violating any algebraic rules. Very astute students (or ones who were warned by students from earlier classes haha) will notice that right at that point in time, you are in fact attempting to divide by zero, which is not possible.

    So the reason you ended up with 1=2 is because you applied rules to something which they definitionally cannot apply to. At that point, the equation became undefined.

    …the funny thing though, is you were able to just…continue. And get something to come out. Now, in this case, that thing was utter nonsense. An amusement for children to help teach them of various pitfalls they might fall into when playing with numbers.

    But what if you were one of the most brilliant mathematicians who ever lived, and you were concerning yourself with questions such as,

    “What would happen if I took [1 + 2 + 3 + 4+ 5….], and subtracted [1 + 1/2 + 1/3 + 1/4 + 1/5…]”

    Now, those are both divergent sums. So we could just call them both infinity. But the second infinity just kind of…feels smaller, doesn’t it? It feels like you should be able to just…perform some type of operation and get…something to come out.

    It wouldn’t be “correct” to do so, but this is basically what Ramanujan did. Illegal math. With a nonsense output of negative -1/12.

    The funny thing though is that this “nonsense output” is actually now a cornerstone of quantum mechanics. It turns out we subtract diverging infinites from each other literally all the time, even just by walking around, and that pesky little -1/12 trick has proven to be consistently useful. Astonishing.

    He died a preventable death at 32. Imagine what the world might have looked like today if only he could have dreamed a little longer, asked more impossible questions, and broken more rules. Specifically he died after a bout of dysentery, in case anyone is confused why they’re reading all this in the shit posting community


  • As the other commenter said, biking is cardio. It has many overlapping benefits with heavy circles (resistance training), but they each have some unique benefits and they grant you those benefits through different biological mechanisms. So doing one or the other is very good, and doing both is extremely good.

    American heart association has a very good breakdown of the benefits of cardio. They recommend 150 minutes per week of moderate intensity cardio (biking slower than 10mph/16kph) or 75min per week of intense cardio (faster than 10mph) to fully cash in on those benefits.

    On a personal note: before “taking the plunge” with any form of exercise, most people experience the same form of “temporal sticker shock” that you’ve expressed concern with. The “need to reserve time” for it.

    It’s very deceptive though, because the short time you invest into it actually gives back so much more time to your life. Like multiple extra hours per day, every day, where you feel refreshed, energetic, and capable of pursuing your passions fully. It’s extremely worth the time you spend upfront




  • Yeah you’re probably right. I was just looking right above the highest point of the cat’s back where there’s a missing dot. In one image there’s four that form a square, in the other the bottom right dot is missing

    Zooming in now tho it looks like the image with the darker cat is heavily compressed, so that particular dot probably just got lost in the process





  • I was reading some breakdown recently, forget if it was the CDC or whoever, but basically they found that the vast majority of Americans were totally good on vitamin D when tested despite survey results indicating people didn’t get enough from their diet generally. This was attributed to sun exposure

    Then I looked it up and in many cases you get your full dose of vitamin D from the sun in literally a few minutes lol. Honestly I think the whole supplement industry in general is just a very successful scam

    Edit: found it, section of note is vitamin d intakes and status.

    evidence suggests that the majority of people have sufficient serum concentrations of vitamin D based on the thresholds set by the Food and Nutrition Board

    If your doctor literally told you to take it then that’s great. The constant fear mongering among the general public about supplements is the scam

    https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/




  • Yeah solving it without following any method probably actually requires you to be a genius or something lol

    I love the established speedcubing strategies tho, it basically changes it from being a puzzle you’re trying to solve into being similar to a rogue-like video game where you get a new “map” each time. Totally different skillset but also super rewarding in its own way