ISSUE-33: Kyle's Siegrist's request for new Content-MathML symbol

statistical symbols

Kyle's Siegrist's request for new Content-MathML symbol

State:

RAISED

Product:

Raised by:

Robert Miner

Opened on:

2008-10-24

Description:

From:

http://lists.w3.org/Archives/Public/www-math/2005May/0002.html


Here is what I would love to see added to Content MathML:

1. Binomial coefficient

2. Permutation coefficient: n(n -1)...(n - k + 1), usually
rendered P(n, k) or nPk or (n)k.

3. A probability operator with an optional "given" construction
(for conditional probability). Typical rendering would be
P(A, B, ...) (without conditioning) or P(A, B, ... | C, D, ...)
(with conditioning).

4. An expected value operator with an optional "given" construction
(for conditional expected value). Typical rendering would be E(A,
B, ...) (without conditioning) or E(A, B, ... | C, D, ...) (with
conditioning).

5. General union, to form the union of Ai over i = a to b, or the
union of Ai where i is in an index set I. This would work just
like the sum construction, with a bound variable and with lower and
upper limits, or with a bound variable and with a condition.

6. Exactly like 5, but with intersection.

If I had these extensions, I think that I could do just about
everything that I wanted without going over to Presentation MathML.

Items 3 and 4 (with the "given" construction) are really important in
probability, statistics, and stochastic processes; conditional
probability and expected value are central notions. Ordinary
probability and expected value can be done with the usual function
("apply") construction, but there is no way to do the conditioning
without adding Presentation MathML as a kludge.

I am really surprised that items 5 and 6 are not already present;
they seem very natural and necessary for lots of areas of math."

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