### Dilution of a series

The inclusion of any finite number of zeros between adjacent terms of a series. For the series

$$\sum\limits_{k=0}^{\infty}u_k$$

a diluted series has the form

$$u_0+0+\dots+0+u_1+0+\dots+0+u_2+\dots$$

Dilution of a series does not affect convergence of the series, but it may violate summability of the series (after dilution a series summable to the number $s$ by some summation method may turn out to be not summable at all by this method or may turn out to be summable to a number $a\ne s$).

/from EoM

### What Affix of a complex number is ?

Let $z=a+ib$ in its geometric representation. The point in the complex plane corresponding to this number, i.e. the point with Cartesian coordinates $(a,b)$. The affix is sometimes identified with the complex number itself.

/from EoM.

### Stanford online course: Quantum Mechanics for Scientists and Engineers

Start Sep 24, 2013

This course aims to teach quantum mechanics to anyone with a reasonable college-level understanding of physical science or engineering. … This course is a substantial introduction to quantum mechanics and how to use it. It is specifically designed to be accessible not only to physicists but also to students and technical professionals over a wide range of science and engineering backgrounds.

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"Pure mathematicians try to discover, analyse, and classify all logically possible abstract structures."

— Alain Bossavit. 1998

Tags: soft math