Math & Science ⇒ Greek letter won't come out bold?

[bazman]

Hi there,

Got kind of a weird problem:

when I type

Code: Select all

\frac{df_t^i}{f_t^i}= \mu^i(\{\textbf{f}_{t}\},\{ {\sigma}_t\}) 

I have no problem and the text displays as you would expect:

however when I try:

Code: Select all

\frac{df_t^i}{f_t^i}= \mu^i(\{\textbf{f}_{t}\},\{ \textbf{\sigma}_t\}) 

It outouts the sigma as a series of sigmas gradually getting smaller?

If I want to make a greek letter bold I assume I should be using some other function?

[frabjous]

You might want to try the bm (bold math) package.

And if you don't, you should use \mathbf to make letters bold in math mode, not \textbf.

[bazman]

that is prefect thank you

[localghost]

With the preferably to use amsmath package you can get also bols math symbols (and even whole math expressions).

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\[
  \frac{df_t^i}{f_t^i}= \mu^i(\{\textbf{f}_{t}\},\{\boldsymbol{\sigma}_t\})
\]

Further explanations can be taken from the manual.


Best regards
Thorsten