Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/src/cmd/postscript/tests/troff1

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Distributed under the MIT License.
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.EQ
delim $$
.EN
.TS
doublebox;
c c
l l.
Name	Definition
.sp
.vs +2p
Gamma	$GAMMA (z) = int sub 0 sup inf t sup {z-1} e sup -t dt$
Sine	$sin (x) = 1 over 2i ( e sup ix - e sup -ix )$
Error	$ roman erf (z) = 2 over sqrt pi int sub 0 sup z e sup {-t sup 2} dt$
Bessel	$ J sub 0 (z) = 1 over pi int sub 0 sup pi cos ( z sin theta ) d theta $
Zeta	$ zeta (s) = sum from k=1 to inf k sup -s ~~( Re~s > 1)$
.vs -2p
.sp 2
.TE

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