Lew <(E-Mail Removed)> wrote:

> On Friday, June 8, 2012 2:34:40 PM UTC-7, Jan Burse wrote:

>> For those who don't know, there exists a set builder notation:

>> http://en.wikipedia.org/wiki/Set-bui...ion#Z_notation
(snip)

>> Forgot where this is taught, in elementary school?

> Riiiight. As nations and smaller school districts remove

> evolution from their textbooks, they're going to teach

> mathematical logic and set theory in elementary school?
For whatever reason, yes, I believe sets are not taught much

in school, maybe not until calculus where you need them for

continuity proofs. Maybe in geometry, but not as far as I know.

Some years ago we had "new math" which included a little set

theory and, as I remember number bases (radix) but I believe

even that is gone now.

> In any event, this being a Java forum, the notation '=<'

> (shown nowhere in your reference link, BTW) is rather odd,

> as we are used to '<='. Given that '=<' apparently is not

> part of the "Set Builder" notation, how about we stick with

> the Java (also C, Fortran, C++, C#, Javascript, BASIC, SQL,

> Python, shell, ...) idiom?
I still feel funny using the exclusive or operator as an

exponential operator. Math.pow seems even worse, so I mostly

use the Fortran ** operator in posts, even though I don't write

so much in Fortran these days. There might be some programming

language that allows for =< though I don't remember which one.

-- glen