Operation Onigiri

It is too short notice, but in case you have a chance and interest...

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Time
Wednesday, March 16 · 12:00pm - 6:00pm
Location
Pappelallee 86 10437 Berlin, bei enishi
http://www.facebook.com/event.php?eid=195135683854242&index=1

Liebe Freunde in Berlin, eine Spendenaktion für Japan wird organisiert. Bitte weiter sagen!!

OPERATION ONIGIRI
Was können wir aus Berlin für Japan tun?
Wir sammeln in Berlin die Spende für die Unterstützung der Erdbebenopfer in Japan.
Als Dankeschön geben wir den Spendern Reisbällchen (ONIGIRI).

Wer praktisch helfen möchte oder wer irgendwas zur Hilfe überlegt, bitte helft Ihr uns beim Kochen (Mit Reiskocher ist besonders hilfsreich).

Wer spenden möchte, bitte kommt Ihr vor Ort. Auf jeden Euro/Cent freuen wir uns, es ist eine große Hilfe für Japan.

Wer leider keine Zeit dafür hat, reicht es aus, nur Ideen und Tipps uns zu geben, und den Freunden/Bekannte weiterzusagen.

Wo genau? Ist noch nicht klar, wir überlegen noch. Vielleicht habt Ihr eine Idee?

Vielen Dank für die Aufmerksamkeit!!

Comments

Why A^{T}A is invertible? (2) Linear Algebra

Why A^{T}A has the inverse Let me explain why A^{T}A has the inverse, if the columns of A are independent. First, if a matrix is n by n, and all the columns are independent, then this is a square full rank matrix. Therefore, there is the inverse. So, the problem is when A is a m by n, rectangle matrix. Strang's explanation is based on null space. Null space and column space are the fundamental of the linear algebra. This explanation is simple and clear. However, when I was a University student, I did not recall the explanation of the null space in my linear algebra class. Maybe I was careless. I regret that... Explanation based on null space This explanation is based on Strang's book. Column space and null space are the main characters. Let's start with this explanation. Assume x where x is in the null space of A . The matrices ( A^{T} A ) and A share the null space as the following: This means, if x is in the null space of A , x is also in the null spa

Gauss's quote for positive, negative, and imaginary number

Recently I watched the following great videos about imaginary numbers by Welch Labs. https://youtu.be/T647CGsuOVU?list=PLiaHhY2iBX9g6KIvZ_703G3KJXapKkNaF I like this article about naming of math by Kalid Azad. https://betterexplained.com/articles/learning-tip-idea-name/ Both articles mentioned about Gauss, who suggested to use other names of positive, negative, and imaginary numbers. Gauss wrote these names are wrong and that is one of the reason people didn't get why negative times negative is positive, or, pure positive imaginary times pure positive imaginary is negative real number. I made a few videos about explaining why -1 * -1 = +1, too. Explanation: why -1 * -1 = +1 by pattern https://youtu.be/uD7JRdAzKP8 Explanation: why -1 * -1 = +1 by climbing a mountain https://youtu.be/uD7JRdAzKP8 But actually Gauss's insight is much powerful. The original is in the Gauß, Werke, Bd. 2, S. 178 . Hätte man +1, -1, √-1) nicht positiv, negative, imaginäre (oder gar um

Why parallelogram area is |ad-bc|?

Here is my question. The area of parallelogram is the difference of these two rectangles (red rectangle - blue rectangle). This is not intuitive for me. If you also think it is not so intuitive, you might interested in my slides. I try to explain this for hight school students. Slides: A bit intuitive (for me) explanation of area of parallelogram (to my site, external link) .

Lx=d: SundayResearch

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