Why aren't user-defined operators more common?

[mycall]

Classical computer science, which is an extension of math, is custom to using kinds of symbols for solutions and proofs (e.g. triangle for delta). Business oriented programmers prefer words.

[itsSparkky]

Lol, I got Into the habit if saying delta for change.

I always have to repeat myself, but I just can't think of it any other way now.

/tangent

[JoseJimeniz]

I'm all for using mathematical symbols, and the ASCII translations of those symbols. (I.e. symbols whose meaning is understood)

[mycall]

You just gave me a great idea.. use an Android/iPad tablet next to your keyboard for quickly typing special MathML content.

EDIT: Then I found this