# What's the meaning of this symbol?

1. Oct 17, 2007

### Asuralm

Dear All:

What's the meaning of a equal sign with a triangle over it please?

2. Oct 17, 2007

### HallsofIvy

Staff Emeritus
I will confess that I did not recognize that immediately but according to Wikipedia:
http://en.wikipedia.org/wiki/Table_of_mathematical_symbols
(down near the bottom of the page) it means "is defined as" or "is equal by definition".
After seeing that definition, my reaction was, "Oh, yes, of course, I've seen that before".
Different authors use different symbols for that.

3. Jan 14, 2009

### ben5777

Dear All

what is the meaning of these symbols =,<>,!=,>,<,!<,<=,!>

4. Jan 14, 2009

### HallsofIvy

Staff Emeritus
= means "is equal to"
> means "is greater than"
< means "is less than"
<> means "is either less than or greater than" or simply "is not equal to"

! is a commonly used to mean "not"
!= means "is not equal to"
!> means "is not greater than"
!< means "is not less than"