In the context of relationships, chemistry is a simple "emotion" that two people get when they share a special connection. It is not necessarily sexual. It is the impulse making one think "I need to see this [other] person again" - that feeling of "we click". It is very early in one's relationship that they can intuitively work out whether they have positive or negative chemistry.
== Definition ==
While the actual definition of chemistry, its components, and its manifestations are fairly vague, this is a well documented concept. Some people describe chemistry in metaphorical terms, such as "like...
user84215
user84215
user84215
In mathematics and signal processing, the Z-transform converts a discrete-time signal, which is a sequence of real or complex numbers, into a complex frequency domain representation.
It can be considered as a discrete-time equivalent of the Laplace transform. This similarity is explored in the theory of time scale calculus.
== History ==
The basic idea now known as the Z-transform was known to Laplace, and it was re-introduced in 1947 by W. Hurewicz and others as a way to treat sampled-data control systems used with radar. It gives a tractable way to solve linear, constant-coefficient difference...
0
if $r$ is rational whose denominator is coprime with $p$ then it can be written as $r = a/(p^n-1)$ for some integers $a$ and $n$ and it gives you a relationship between $r$ and $p^nr$.
If you write it as $r = ap^{-n}+rp^{-n}$, you get a way to write $r$ as an infinite sum that converges in the u...
