In my work I have:
J_{\mathbf{\lambda}}(f(\mathbf{p},t))
but pdflatex prited

Why? Maybe I'm not using mathbf correctly?
In my work I have:
J_{\mathbf{\lambda}}(f(\mathbf{p},t))
but pdflatex prited

Why? Maybe I'm not using mathbf correctly?
bmpackage and its\bmcommand instead of\mathbfas it will give you bold sy,bols whichmathbfdoes not. – daleif Mar 26 '15 at 09:00