/sci/ - Science & Math

Hi, im working in a 3 man start up doing online marketing. our developer jumped off and left us with an almost finished app and since we cant find a new guy, i wanna try completing the app. i had c++ in school and want to at least give it a try.

the app is done in react native, thats all i know. in school we had a compiler for c++ and delphi. what do i need for react native? is it android studio with a plugin of some sort? cause i cant find a dedicated software for react native that i can use to code in. the folders i inhererited dont contain an apk.

See if you could solve this, /sci/, as an exercise. It's not homework, don't worry. I already have my solution I will post afterwards.

Let (M, J) be any topological space. For generalized sequences (nets) (Fsubi) [for all i in I] of subsets of M one defines the limes inferior of Fsubi and limes superior of Fsubi and convergence analogously as for sequences. Show that every generalized sequence of subsets of M contains a converging generalized subsequence. (Hint: use Tychonoff's Theorem)

Penguins for motivation.

What are the primary ideas used in Itzhak Perlman's proof of the Poincare conjecture?

Is there a scientific way to estimate I.Q. based on consumption of media (e.g. T.V., books, movies, music, video games), education, politics, religion, interests?

What IQ do you need to get a PhD in Theoretical Physics at Princeton?

Why do mathematicians pronounce homotopy, homological, etc with a long o ?

If mathematicians can mispronounce Greek words why can't people use math non-rigorously e.g. 1 + 2 + 3 + ... = -1/12 ?

If you wanted to say this phrase
"I don't like [belief 1] and I just love [belief 2]", butt happened to mix up the words due to an anxiety disorder:
"I don't like [belief 2] and I just love [belief 1]" instead,

Will your beliefs change? Will your personality change? Will anything in your brain change?

Is math at its foundation just bean counting?

Math represents a system of white male supremacy. Students are forced to follow hegemonic Aristotelian mode of thinking and be judged by panels that conform to the hegemonic structures of modern mathematical terminologies and modes of reasoning in order to gain credentials to teach or achieve any hope of getting a good job.
The negative influence of the universities both surpass and predate “mathematical cranks” and “poor reasoners” in their scope and magnitude. Cranks are made out to be a great threat to logical thinking, numeracy, &c. but polls indicate that math requirements are simply a way for universities to extract even more money for themselves by requiring art history majors to learn esoteric statements such as the epsilon-delta definition of continuity. The elitist nature of math is indicated by the use of “recursive” to mean “computable”. The idea that people somehow have an inability to think logically and therefore need to be "corrected" by the learned mathematicians is as old as the University system itself, so that people don't look at their own problems wonder why they need to pay tuition at Universities. The truth is that logical and mathematical thinking is in fact easy; Archimedes, Newton, Euler, &c were making correct arguments long before modern standards of "rigour", yet the mathematical guild wishes to destroy such insights and enforce rigid neo-Aristotelian modes of thinking, Those who tell the truth about the mathematical establishment or suggest alternative theories are met with total annihilation. Notice that Erdos or Perelman aren't "cranks" even though they are certainly eccentric and did not have academic jobs. Why is that? Because they fit the racial and sexual stereotypes of a "mathematician" and their theorems were accepted by the mathematical guilds.

wtf is a complex number

I want to pay someone else to write the following book. And if someone else won't write it, maybe I will.

Applied Mathematics for Niggers (aka Economists)

max 700 pages
Chapters:

Linear Algebra I (matricies, systems of equations, vector spaces, linear transformations, eigenthings; with applications to linear economic models)
Partial Differential Calculus (limits and continuity in Rn; gradient, Jacobian, Hessian; maps from Rn to Rm; implicit and inverse function theorems; unconstrained optimization, Lagrange multipliers, and equilibrium concepts; the focus is on systems of equations as seen throughout economics)
Multiple Integrals (standard topics with emphasis on applications to probability; the last section would cover Bayesian inference)
Linear Algebra II (least squares; singular value decomposition; LU, Cholesky, QR, Schur, and other funky matrix decompositions you occasionally use in econometrics; some extended attention is given to quadratic forms and symmetric matricies)
Theory of Optimization (Lagrangeans, Hamiltonians, Bellmans; the classical results regarding existence and uniqueness; the classical results regarding characterization, regularity, and sensitivity; Berge's theorem)
Complex Variables and Fourier Series (for the time-series folks)

Prerequisite: Calculus I-II are assumed.

What isn't here: There is a market for books on advanced calculus. However, they are all geared towards engineering and physics students. They have a ton of material on differential equations and vector theory that are irrelevant for niggers. So I cut all of those bits out and replace them with additional material on matrix analysis and optimization. Basically, I trade the theorems of Green, Gauss, and Stokes for the theorems of Lagrange, Hamilton, and Bellman. It's a reasonable tradeoff. I also throw away the (i,j,k) notation and spend more time on least squares, which would be brought back to its proper home in linear algebra.

A moviegoer parks his car in the lot. An extortionist, whom the moviegoer has excellent reason to trust, says to the moviegoer, “If you pay me $10, I’ll ensure that your windshield is unbroken when you return. But I’ll smash your windshield if you don't pay me.” Let X be the proposition that the winshield is smashed when the moviegoer returns and let Y be the proposition that the moviegoer should not pay the extortionist. If X, then not paying is better than paying. If ¬X, then not paying is better than paying.

But it seems like we should not conclude that not conclude Y because it is cheaper to pay $10 than to replace the winshield.

Does it even make sense to major math anymore? In my country, math graduates at both the bachelor, master, and doctor level are saying they will have to immigrate to the United States of America to find work. From what I have seen on the news, the United States is a third-world country run by a crazy dictator named Dump or Frump or something, where most people have no security, health care, or paid vacation or parental leave. You can't even get euthanasia as you die a slow and painful death of cancer without health care because that is mortal sin and the slippery slope to Nazi death camps.

Suppose you have finitely many dogs and one goat. The goat won't go anywhere a dog can reach. Is it possible to place tethered dogs, so that the untethered goat is constrained to a triangular area?

Fuck Combinatorics! Jesus Christ what a useless fucking branch of math, I used to think I was good at math until I came across this bullshit, this reminds me of back in 6th grade when I enrolled in an afterschool class that basically taught me I was shit at math, the fucking hell with this bullshit subject literally thought about the problem for like 2 hours and then just started daydreaming about various ways to kill myself elegantly instead of solving the problem lmao just fuck combo
FUCK COMBO

Any research on the effect of ecigs on body

>>9580183
division and multiplication distribute over addition

>>9536585
...999.999... = 0 fight me

>>9519180
the absolute state of biologists

One day, you are talking to your friends about your favorite mathematician, Oiler. Your friends say that even if Oiler had not died in 1783, he would still be dead today. You take the contrapositive, and conclude that if Oiler were alive today, he would have died in 1783. Your friends say that this makes no sense. After a heated discussion, you lost track of the time and wonder what time it is. Your friends say "If it is after two o'clock, it is not much after two o'clock." You take the contrapositive, and conclude that if it is much after two o'clock, it is not after two o'clock at all, a clear contradiction!

Is there a scientific way to estimate the level of intelligence needed to do various activities? e.g. to understand various novels or TV shows, learn various natural or programming languages given that one is an adult who already knows English but not any other languages, or understand various subjects.

Is there a scientific way to estimate someone's intelligence from various facts about them e.g. educational, job, tastes in music, literature, TV, vidya games etc. ?

The true foundation for maths
http://web.maths.unsw.edu.au/~jim/irv.pdf

Getting out of the Military soon and I'll have my GI Bill to use. I have a B.S in Bussiness Organization conc in HR & Organizational Mgmt. Feel that MBA would waste nowadays.

>I wanted to do Comp Sci or Engering but I CANT Math for shit.
>Thinking about Masters in IT
>What are other Master Programs I can do that will allow me to be near high tech/stem related projects without having to catch up on 3 years worth of math just to do start the major

The Big Bang never happened.

The universe is expanding because there's a massive black hole in the shape of a sphere surrounding the universe.

how the fuck does it have value, what determines its value

i feel like alot of it is like "we really don't know how this shit works, but it works"