I want to boldify math equations and symbols with out changing the actual font.

I tried the following, but I am not getting satisfactory results.

```
a=f \equiv 2 \mod 4
\bm{a = f \equiv 2 \mod 4}
\mathbf{a = f \equiv 2 \mod 4}
{\boldmath $a = f \equiv 2 \mod 4$}
```

The output for the above tags is as follows

I want my equation like the third line with fully bold, but with preserved alphabet font as in line 1.

`\bm`

is not boldifying the entire equation, and `\boldmath`

is not boldyfying at all. How can I preserve alphabet font using `\mathbf`

?

## Best Answer

You need

`\bm`

or`\boldmath`

, not`\mathbf`

Of course the bold symbols need to exist, not all font sets include bold.