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Path: utzoo!watmath!clyde!burl!codas!peora!pesnta!phri!roy
From: roy@phri.UUCP
Newsgroups: comp.text
Subject: Setting large slashed fractions with eqn
Message-ID: <2590@phri.UUCP>
Date: Wed, 4-Feb-87 13:47:01 EST
Article-I.D.: phri.2590
Posted: Wed Feb  4 13:47:01 1987
Date-Received: Sat, 7-Feb-87 09:21:11 EST
Reply-To: roy@phri.UUCP (Roy Smith)
Distribution: world
Organization: Public Health Research Inst. (NY, NY)
Lines: 43


        I want to set the following fraction:

                     /
                    /   N     +---        --+ 2
                   /   ----   |      N!     |
              1   /    \      |  ---------- |
                 /     /      |   (N-n)!n!  |
                /      ----   +---       ---+
               /       n = 0

but the best I can come up with is:

        .EQ
        up 30 1 over
        { down 30 { sum from { n ^ = ^ 0} to N
        { { left [ N! over { (N-n)!n! } right ] } sup size +2 2 }
        } }
        .EN
                      X
which gives you the  --- form instead of the X / Y that I want (no comments
                      Y

about which is the "preferred" style, please).  The problem is that I can't
figure out how to get the large-sized "/" in eqn.  Is it possible, short of
doing something sick like "size 36 /"?

        BTW, withough the "up/down 30" commands, the numerator and
demoninator run right into the fraction bar.  Also, the superscript 2 comes
out too small unless I do the "size +2" stuff.  Is this because I did
something wrong or is it an intrinsic eqn problem?  Could it be badly
designed fonts?  I did this on an Apple LaserWriter, using Times and
Adobe's transcript package (i.e. ptroff).

        Presumably TeX has an easy way to do this; if somebody could show
we how to do it in TeX, without any religious flamage about TeX vs. troff,
I would appreciate that too.
-- 
Roy Smith, {allegra,cmcl2,philabs}!phri!roy
System Administrator, Public Health Research Institute
455 First Avenue, New York, NY 10016

"you can't spell deoxyribonucleic without unix!"