# Thread: how to create def symbol?

1. ## how to create def symbol?

Please, help me define a math symbol for definition as shown in

Table of mathematical symbols - Wikipedia, the free encyclopedia

is defined as; equal by definition

it is the equal sign under a small font 'def'

the same symbol is also provided in OpenOffice math, but not in Latex.

Thank you all.
Stephen

2. Originally Posted by xvtstephen
Please, help me define a math symbol for definition as shown in

Table of mathematical symbols - Wikipedia, the free encyclopedia

is defined as; equal by definition

it is the equal sign under a small font 'def'

the same symbol is also provided in OpenOffice math, but not in Latex.

Thank you all.
Stephen
Why not just use $\displaystyle :=$?

3. Originally Posted by xvtstephen
Please, help me define a math symbol for definition as shown in

Table of mathematical symbols - Wikipedia, the free encyclopedia

is defined as; equal by definition

it is the equal sign under a small font 'def'

the same symbol is also provided in OpenOffice math, but not in Latex.

Thank you all.
Stephen
You can define them:

\buildrel\triangle\over =

gives:

$\displaystyle \buildrel\triangle\over =$

and:

\buildrel d\over =

gives:

$\displaystyle \buildrel d\over =$

(we can't put "def" over "=" because our LaTeX always seems to throw an reserved word exception to any string starting def.

and of course \doteq gives $\displaystyle \doteq$

CB

4. Originally Posted by CaptainBlack
\buildrel\triangle\over =

gives:

$\displaystyle \buildrel\triangle\over =$
\triangleq : $\displaystyle \triangleq$

5. Originally Posted by CaptainBlack
\buildrel d\over =

gives:

$\displaystyle \buildrel d\over =$

(we can't put "def" over "=" because our LaTeX always seems to throw an reserved word exception to any string starting def.
You can fool the system into accepting a reserved word like def by disguising it, splitting it up with a pair of braces.

$$\buildrel \text{d{}ef}\over =$$ produces $\displaystyle \buildrel \text{d{}ef}\over =$ .

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### equal by definitions

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