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/sci/ Science & Math

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Most viewed threads in this category

12 more posts in this thread. [Missing image file: ]
What's to prevent me from making a more-than-perfect refrigerator in a blatant violation of entropy by layering hundreds of finely spaced photoelectric plates which will turn each other's thermal radiation into usable energy?

College professors

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You ever feel that a college professor didn't like you? Last semester there was a Math professor who had a "meh" to me face while this semester I have a Chemistry professor who has the "what are you doing here" look. Heck, I was taking a Chemistry test today and he kept standing near me. Plus, he was staying have a nice spring break to the other students while he just nodded at me as I left. Both were white while I am Chicano.

Contemporary Genius

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Who would /sci/ consider living geniuses? The Da Vincis, Gausses, Wittgensteins, and Turings of our time. Pic related.

Help me understand this SICP exercise

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One variant of the Fermat test that cannot be fooled is called the Miller-Rabin test (Miller 1976; Rabin 1980). This starts from an alternate form of Fermat's Little Theorem, which states that if n is a prime number and a is any positive integer less than n, then a raised to the (n - 1)st power is congruent to 1 modulo n. To test the primality of a number n by the Miller-Rabin test, we pick a random number a < n and raise a to the (n - 1)st power modulo n using the expmod procedure. However, whenever we perform the squaring step in expmod, we check to see if we have discovered a "nontrivial square root of 1 modulo n," that is, a number not equal to 1 or n - 1 whose square is equal to 1 modulo n. It is possible to prove that if such a nontrivial square root of 1 exists, then n is not prime. It is also possible to prove that if n is an odd number that is not prime, then, for at least half the numbers a < n, computing an ? 1 in this way will reveal a nontrivial square root of 1 modulo n. (This is why the Miller-Rabin test cannot be fooled.) Modify the expmod procedure to signal if it discovers a nontrivial square root of 1, and use this to implement the Miller-Rabin test with a procedure analogous to fermat-test. Check your procedure by testing various known primes and non-primes. Hint: One convenient way to make expmod signal is to have it return 0. ----- How can a number not equal to 1 be equal to 1 modulo n if 1 modulo n is always 1 (see sentence starting with However)?

Ez pz prob

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How long would it take for you to bleed out after shooting yourself in the brain?
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Hey /sci/ What are some scientifically proven ways to prevent myself getting triggered so much? >watching sword art online during my time off from work >enjoying it very much >suddenly get passive aggressive email from boss telling me I got 10 times more workload to do once my little holiday is over >feel like puking >contemplate suicide >accidentally give sword art online a 1/10 review >can't stop thinking of all the work i gotta do when I get back
11 more posts in this thread. [Missing image file: ]
Any help?
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All you hear in undergrad is >DON'T EAT OR DRINK IN THE LAB >DON'T EAT OR DRINK IN THE LAB >DON'T EAT OR DRINK IN THE LAB At what level can I have a bottle of water or a cup of tea in the lab? What's wrong with having a snack while I'm babysitting some boring reflux reaction?
55 more posts in this thread. [Missing image file: ]
Is Principles of Mathematical Analysis really that good or is Analysis by Tao better?
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Why are all of the geniuses have curly hair? >Euler >Gauss >Einstein This proves that, if your hair is straight you are a brainlet. Note that the reverse is not true though, you can still have curly hair and stupid.
113 more posts in this thread. [Missing image file: ]
Today we started a collaborative group in learning Logic. We recognize the discipline of Logic as a useful tool for mathematical logic/philosophy, analytic philosophy, compsci just to name a few of disciplines you can apply it. We're looking for lads who are also beginners in the discipline of Logic and want to join our journey in learning, understanding, discussing etc. Our main source material for now is this: http://people.ucalgary.ca/~rzach/static/open-logic/open-logic-complete.pdf It's a textbook of formal logic/metalogic and formal methods/systems, it is very friendly to people with no mathematical background (students of philosophy/computer science/etc). Join us in Slack (a website for collab group chats) You can create a throwaway email account if you're worried about privacy, post here to get invited. >hey fag no one cares So far I managed to get 7 people from another board, we're still settling around, looks promising though.

Interesting divergence challenge

7 more posts in this thread. [Missing image file: ]
My prof told me that the series from N=1 to infinity of the Ln((n+1)/n) diverges, but yet it everytest I do it comes out as convergent. What game is he playing? He wont give me the answer because his grad school prof did the same to him. He said it took him two months to come up with the proof.
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>most people only use 10 % of their brains
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What has Stephen Hawking contributed to science? Is he based or just a meme scientist?
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Anyone know of a reaction using fairly simple reagents that will change the color of a solution, with a measurable time constant? I need to measure change in color concentration as a function of time after mixing together some reagents. My first thought was to use red cabbage and an acid/base but the color change takes place almost immediately. Another thought I had was to mix some soda with bleach. It seems like that reaction would be measurable over a few minute time span, https://www.youtube.com/watch?v=yACz4LBwCck The problem though is that I need to make this demonstration safe for grade schoolers, so it's probably not a good idea to use highly toxic chemicals like bleach, not to mention that having grade schoolers handle bleach-soda is a recipe for disaster. Any suggestions?
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>engineering is hard! >maths is just calculus and linear algebra in most cases >physics is newtonian baby physics When will this meme die? The hardest part of engineering is for heterosexual men to get used to all the dick sucking.
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Whenever I try to study my mind will wander. The thing is I don't realize my mind is wandering for a few minutes. Finally once I realize I will try really hard to focus. The result ends up being just reading or listening to individual words, but not actually comprehending the sentences. Like even basic sentences will just become a series of unrelated words when I try to read them. Then my mind starts to wander and the cycle keeps repeating. I retain almost nothing. How can I stop this from happening? pls no just do it memes
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I'm dumb as fuck. All family members are dumb as well. If I marry a scientist or something what is the chance that the kid will be smart?
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Who here goes to a shitty university? I'll start >accepted for neuroscience >all profs are paki >grades are handed out like candy >buildings falling apart >litterally a joke to employers

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