The 17 equations that changed the world

World Economic Forum ^ | 4 Apr, 2016 | Andy Kiersz

[who_would_fardels_bear]

They missed one:

1 + 2 + 3 + 4 + 5 + ... = -1/12

Supposedly this is a key to understanding String Theory

Also a key to understanding why everything is so totally messed up today ... even down to the math.

[MtnClimber]

Maxwell’s Equations were in the list.

[dr_lew]

Maxwells equations ought to be in there somewhere

They are!

[InterceptPoint]

Why not just read the article. It is interesting.
++++
LOL. What??? You want me to break with a well established Freeper tradition?

Actually I thought it would be more fun to make my own list. After looking at the list I’m thinking I did pretty good. I should have put in the a squared plus b squared equals c squared bit and the basic definition of differential calculus.

[InterceptPoint]

And it’s a good thing they are. I was ready to call my lawyer if they were left out.

[CodeToad]

Yeah! What’s with all those uppity white people and that numbers stuff?/

[AlmaKing]

marriage = kids + pool + house - money^2 -sex^3

[dr_lew]

The big question used to be, “Do the solutions of the Navier-Stokes equation include turbulence?”

Surely this must have been resolved by now! But I haven’t heard.

... heh. The Wikipedia article on Navier-Stokes addresses the issue, but indicates that it has not been entirely resolved, as a “raw” numerical approach does not make the grade. Phathinatin!

[theoilpainter]

Actually, understanding none of this, I went to law school.

[qam1]

Women = Money * Time
Time = Money
Women = Money ^ 2
Money is the root of all evil
Women = Evil

[FredZarguna]

Hard to take a list seriously that doesn't include some version of

1) C = 2πr

2) a₀ + a₁x + a₂x²+ ... + a_nxⁿ = 0 has at least one complex root for every n > 0. [The Fundamental Theorem of Algebra]

3) f(x) = d/dx ∫_a^x f(t) dt [with suitable restrictions on f. The Fundamental Theorem of Calculus.]

4)

The binomial Theorem.

5) Euler's formula: e^iθ = cosθ + i sinθ

All of these are far more important than the Navier-Stokes equation, The Shannon Entropy Information Equation, May's Map, or The Black-Scholes Equation.

[Arrian]

Equations changed nothing. What they represented did.
Euclid conceived a point in space, then another and another. Next he moved the points closer together, thereby creating a line. Then he repeated this scenario w/points north to south from the endpoints of his initial line. Lastly, he enclosed his first 3 lines w/a 4th line, giving us a Square; a two dimensional shape! Further he expanded his concept to create a Cube, a three dimensional shape.
The astounding genius of Euclid (as well as the Greeks of Antiquity) created Geometry, the linchpin of Engineering which allowed us to create the structures of the modern world.

[dr_lew]

... and where’s “e to the pi i = -1” ?

Of course, this is really an encapsulation of “e to the i theta = cos theta + i sin theta”, and this is a pretty big miss IMHO. I don’t think “i squared = -1” covers it.

[Heart-Rest]

(((2 * clinton) + 1 obama) - 1/2 harry “blackeye” reid) / the number of dead people who voted for all of them = the stinking stench of the bowels of hell

[piytar]

Yup. Finite element analysis using supercomputers approximate some solutions. But no formal mathematical solution for turbulence has been derived. In fact, that may be an NP-complete problem (in other words not solvable) because of some underlying issues involved.

[So Cal Rocket]

As a corollary to Euler’s theorem, it fascinates me that:

e^(pi x i) = -1

The fact that three somewhat unrelated concepts such as e, pi and i can be put together to make such an elegant formula blows me away.

[InterceptPoint]

I agree. It was a big miss.

[FredZarguna]

Here is a little rhyme I used to recite to my students:

It is a remarkable fact
that i to the i
is the same thing
as the square root of one
divided by e to the pi.

That is: iⁱ = √(1/e^π)

This is a remarkable equation, in that 1) a pure imaginary raised to itself is a pure real number 2) the result contains arguably all of the most fundamental constants in mathematics: i, e, π, 1, (and implicitly, 2).

[Do the math]

“Navier-Stokes equation include turbulence?”

Yes, Navier-Stokes equation would help us understand non-laminar flow. My work involves a dumbed down version of this equation to a simple system of odes with a penalty function on the boundary conditions. I have had no luck in solving these equations, I am going to build a super computer using several raspberry pi computers to try to solve them numerically.

[ProtectOurFreedom]

Who could forget this basic equation?