[comp.text.tex] How to generate bold math italic typeface?

ndeng@EULER.BERKELEY.EDU (12/12/90)

Hello netters,

I frequently need to write math equations in plain TeX and find that I cannot
get the bold math italic characters, as used often to refer a vector or a 
matrix. Is there any trick in the TeX book that I didn't uncover, or I need
some special fonts to do that? I hope your Texperts can share your experience
with the netters.

Forgive me if this question is asked a zillion times but I am really ignorant
and cannot figure out how to do it.

Please respond to this account since I don't read the newsgroup regularly. If
there is a general interest, I'll post a summary.

Mike
ndeng@euler.berkeley.edu