Oscar Lopez wrote:
> But as Paul has pointed out mathptmx has no bold symbols. Therefore lyx has
> to load something to the preamble in the case math boldsymbols are
> required. Either a \usepackage{bm} together with \usepackage{mathptmx} are
> added or only \usepackage{bm} is loaded. Please note that the first
> solution produces math boldsymbols with poor quality while the second uses
> Computer Modern fonts.
from psnfss2e.pdf:
"There are no bold math fonts [in mathptmx], and \boldmath has no effect. Use
of the package bm in conjunction with mathptmx is not recommended."
The reason is that there are no free bold math fonts available (yet) that
match Times Roman. In the past, LyX simply loaded the computer modern math
fonts. However, this is bad typography -- we have mixed fonts that do not
match at all.
Conclusion: if you need bold math characters, Times Roman is not a good choice
(if you insist on mixing fonts that do not match, you can still load Times
Roman as roman font only with
\def\rmdefault{ptm}
which is still better than \usepackage{times}).
Jürgen
