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Randall Lee Reetz's profile photo
 
How exactly is this computational and applied math? Moderation please.
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Prof. Slemrod gives a talk about latest surprising results about Navier Stokes Equations.

The Boltzmann equation does not translate into the Navier-Stokes equations in all cases, because the Navier-Stokes equations — despite being exceptionally useful for modeling the weather, ocean currents, pipes, cars, airplane wings and other hydrodynamic systems, and despite the million-dollar prize offered for their exact solutions — are incomplete.
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Helger Lipmaa's profile photoAlfredo Brant Carl F. Arquero's profile photoRajan Gosavi's profile photoBoro GROZDANIĆ's profile photo
3 comments
 
in a field where error estimation is fundamental; being pedantic about the delineating scales of accuracy seems plausible...ergo: "incomplete" is misleading; as far as their derivation goes, they're as accurate as the assumptions used...the continuum model itself is a rogue assumption (confer analysis at nano-scales - it all falls apart!) - oh wait! +Pietro Santagati   , you're just being provocative, right? nice one! as you got +MMaurice Bendou  in a tight knot...hahaha (applause)
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Arthur Lawrence

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This is a Source and a Sink by the formula (Ln(z-2)+iLn(z+2)) and could be applied to weather-high and low or to electricity.
z = x+iy
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Manuel Alzurutt's profile photo
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BINNOY PANICKER

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[1] How Sin( ) is a measure of how perpendicular two objects/ forces are.

[2] How cos is a measure of how parallel two forces/ objects are.

[3] i = Rotation by 90 degrees. i^2=Rotation by 180 degrees.
i^3 = Rotation by 270 degrees.
i^4= Rotation by 360 degrees.

[4] Transpose of a Matrix = Rotation by 180 degree.

Transpose of (Transpose of) a matrix = Rotation by 360 degrees.

[5] e^i(angle) = rotation by that angle.

[6] sin(30) = 1/2 because at 30 deg the influence of a force/object reduces to half.

For example the shadow of a stick reduces to 1/2 at 30 deg.

[7] A x B = |A| |B|sin(angle btwn A & B).

total combined impact in cross product depends upon.. . . . .
how strong A is
how strong B is.
How perpendicular A and B are w.r.t each other.

e.g A ball hitting a wall will produce max impact at 90 deg.

Pdf book link
https://gumroad.com/l/visualizingmaths-e-book

Blog link
https://visualizingmathsandphysics.blogspot.in


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Arthur Lawrence's profile photoManuel Alzurutt's profile photo
 
Love the X + iY of the Math world ~
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Construction of solid of revolution in geogebra 5
 ·  Translate
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Manuel Alzurutt's profile photo
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Apparently, there is the O'Reilly's R Packages book site with the complete text and code.
Enjoy!
R packages. This is the book site for “R packages”. It published with O'Reilly in April 2015. You can order a copy from amazon. Cover image. Packages are the fundamental units of reproducible R code. They include reusable R functions, the documentation that describes how to use them, ...
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VonVictor Valentino Rosenchild's profile photoManuel Alzurutt's profile photo
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Adam Millbery

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AVP, Quantitative Analyst role in London open to individuals with a PhD in Physics, Mathematics or Engineering. 

For further information, please contact adam.millbery@radleyjames.com
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David Binner

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Discrete Fourier Transform (DFT) Utility

I finished coding and posted online another numerical math tool. This one is a Discrete Fourier Transform utility.
It accepts a data sequence of an unspecified size and computes the Discrete Fourier Transform coefficients.
If anybody in this community uses DFTs, I welcome feedback. I have run many tests on it and it seems to work fine; however, the more testing the better, so if anybody else would like to run some data tests through it, all the better. (If it does not work on a particular data sequence, please contact me, or reply to this post, letting me know the data set that caused it to fail.)
References: The utility posted on this page is a Javascript translation of the FORTRAN routine EZFFTF.FOR, by Paul N. Swarztrauber, National Center for Atmospheric Research, Boulder, CO, which is posted on the FFTPACK site as EZFFTF. Although all care has been taken to ensure that the ...
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VonVictor Valentino Rosenchild's profile photo
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Made this in C++. What do you think?
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AvZ “Astatine” NaV's profile photoNancy Schroepfer's profile photoDaniel Gomez's profile photoManuel Alzurutt's profile photo
4 comments
 
This is cool!!
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Harrison Totty

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Does anyone here have any experience with programming their own symbolic mathematics library and would like to share a few tips? I have been working on one for a while now in C# and have a few questions concerning some simplification algorithms.
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He-chien Tsai's profile photoHarrison Totty's profile photo
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According to benchmark game, their performance are similiar. Notice that pattern matching and tail-call in F# is optimized, It's beneficial to expression trees and symbolic maths.

http://benchmarksgame.alioth.debian.org/u64q/compare.php?lang=fsharp&lang2=csharp
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Wyatt Johnson

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Does anybody know what type of chip this is?
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Mbuso Yende's profile photoWyatt Johnson's profile photo
8 comments
 
+Alexandre Keledjian yep it is...
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Gary Johnson
owner

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MMaurice Bendou's profile photo
3 comments
 
I just uploaded some pictures and images..About the work of David Hilbert, parts of his work I studied of course......
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Arthur Lawrence

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Showing the beauty of Complex Math, where squares can be curved and still be at right angles to each other. The function f(z) is (z-1)/(z+1), where z=x+iy.
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Manuel Alzurutt's profile photoMath Solver's profile photo
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What's The Mathematical Formula For Freedom, Justice And Liberation For *The Descendants Of The Victims Of The Triangular Trans-Atlantic African Enslavement Trade System, (The TTAAETS),The Africans In The Americas?!
 
ARE THERE ANY LIVING PARTICIPANTS (THE PERPETRATORS AND THOSE WHO AIDED AND ABETTED TO ASSAULT AND THEN MURDER) IN THE LYNCH MOB MURDERS OF AFRICAN AMERICANS?

WHO ARE AND WHERE ARE THE DESCENDANTS (THEIR CHILDREN, OFFSPRING) OF THE LYNCH MOB MURDERERS OF AFRICAN AMERICAN AND OTHER NON "WHITE" AMERICAN PEOPLES TODAY?

WHY, THEY'RE IN THE NATION'S ARMED FORCES! AND THEY ARE IN THE NATION'S VARIOUS LAW ENFORCEMENT AGENCIES!

THEY ARE CALMLY WALKING INTO AFRICAN AMERICAN PEOPLES' CHURCHES AND MURDERING TRUSTING, PEACEFUL UNARMED, INNOCENT PASTORS AND CHURCH-GOERS!

THEY ARE BURNING AFRICAN AMERICANS' CHURCHES ACROSS THE SOUTHERN US;

THEY'RE MASQUERADING AS POLICE OFFICERS AND JUMPING ONTO CAR HOODS AND FIRING MULTIPLE GUN SHOTS AND MURDERING INNOCENT CIVILIANS WHO WERE ARE ONLY SUSPECTED OF CRIMINAL ACTIVITY;

THEY'RE SHOOTING TO DEATH HAND-CUFFED, SUBDUED, AND EVEN FLEEING, UNARMED CIVILIANS;

THEY ARE SEVERING THE SPINAL CORDS OF MISCHIEVOUS, POT-SMOKING YOUNGSTAZ'!

(AND THESE DESCENDANTS, THESE OFFSPRING, THESE CHILDREN OF THE PERPETRATORS OF THE ASSAULT AND LYNCH MOB MURDERERS OF AFRICAN AMERICAN AND OTHER NON "WHITE" AMERICAN PEOPLES, ARE HERE, TODAY, GETTING AWAY WITH MURDER WITH THE AIDE OF THE STATE AND FEDERAL LEVEL PROSECUTORS; THEIR BROTHER AND SISTER DESCENDANTS), OF THE PERPETRATORS IN THE BRUTAL AND VICIOUS ASSAULTING AND THEN LYNCH-MURDERING OF AFRICAN AMERICANS AND OTHER NON "WHITE" AMERICANS ACROSS THE UNITED STATES OF AMERICA!

AND TODAY, ACROSS THE WORLD, THIS EVIL, CRIMINAL BEHAVIOR IS STILL BEING PERPETRATED BY THESE DESCENDANTS [OF THE ASSAULT AND LYNCH MOB MURDERERS OF AFRICAN AMERICANS AND OTHER NON "WHITE" AMERICAN PEOPLES], AND THEIR ALLIES ON INNOCENT GOVERNMENT OFFICIALS AND CIVILIANS ALL ACROSS THE NON CHRISTIAN AND NON "WHITE" WORLD!

AND, THE OFFSPRING, THE DESCENDANTS, THE CHILDREN OF THOSE THAT VICIOUSLY ASSAULTED, [EVEN BURNED THEM ON PILES OF WOOD, "HAVING A NIGGAH' BAR BQ", THEY CALLED IT], THEN LYNCH-MURDERED AFRICAN AMERICANS AND OTHER NON "WHITE" AMERICAN PEOPLES--
THEY ARE SITTING ON THE GRAND JURIES FOR THEIR NEIGHBORS WHO ARE IN THE STATE'S ATTORNEY OFFICES IN THE AMERICAN INNER CITIES; THAT'S WHERE THEY ARE!
For years the U.S. government allowed racist white lynch mobs to murder Black men, women and children for practically nothing. The lynchings were so absurd one could argue that Black people’s lives were little to no value at all.  In fact, between 1882 and 1930 in just the 10 southern U.S. states of Florida, Tennessee, Arkansas, …
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Bill Ox's profile photoDaniel Matthews's profile photo
3 comments
 
+A. Hutsona He is trying to pull an irrational number on us? 
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Rajesh D

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Mbuso Yende's profile photoRajesh D's profile photo
2 comments
 
I want to know which dounds richer, not cleaner.
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A old, but useful, article about how to understand and use fstab. 
How to edit and understand /etc/fstab - 1.1. Author: Nana Långstedt < nana.langstedt at gmail.com >. Many other great articles can be found at Nana´s website, Tuxfiles.org. There's a file called /etc/fstab in your Linux system. Learn what its contents mean and how it's used in conjunction with ...
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Manuel Alzurutt's profile photo
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Does anyone know anything about xlwings in python and have tutorials that can teach me?
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MMaurice Bendou's profile photo
 
No I don't use both of them !!! For numerical analysis I use other sof...
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Harrison Totty

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You guys might enjoy this blog post :)
I have been long due for an update to the development blog of my project. Truth is, I got a little sidetracked with a lot of personal things (I promise I wasn't too lazy!). That being said, I have a...
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Harrison Totty

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That class diagram though...
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