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From: umbraticus@prosimetrum.com
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Subject: Re: [9front] troff & eqn sqrt{} output as pdf
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So we discovered that this change:

diff -r 6086ad8502ee sys/lib/postscript/prologues/dpost.ps
--- a/sys/lib/postscript/prologues/dpost.ps	Fri Jan 15 19:32:02 2021 +0100
+++ b/sys/lib/postscript/prologues/dpost.ps	Sun Jan 17 22:17:45 2021 +1300
@@ -188,1 +188,1 @@
-	/radicalex		[-50 0 500 0]
+	/radicalex		[-50 0 500 1]

makes this:

; echo '.EQ
sqrt {g} = pi
.EN' | eqn | troff -ms | dpost | ps2pdf | page

work but have no idea why.
Making the changes suggested at:

B /sys/lib/postscript/prologues/dpost.ps:169,176

didn't help but changing that 0 to 1 (or anything else!)
seems to do the trick for whatever reason.
Any thoughts? or just push it?

Ethan → can confirm on a 5 page report that it fixes all instances of roots

I also checked man -t eqn | dpost | ps2pdf | page

umbraticus