eqn sqrt and pdf?

[Marc Chantreux]

hello people,

I try to get a correct rendering for this simple eqn

    .EQ
    sqrt a over sqrt c
    .EN

first i tried

    eqn -Tpdf|groff -Tpdf

and noticed that the begin of the square root symbol is replaced by a
rectangle that goes down to the bottom of the symbol.

also i tried

    eqn |groff ; ps2pdf14

the ps rendering is fine but the pdf one got the same issue.

for the moment i have a very limited knowledge about troff, ps and pdf.
can someone please help me?

also: i think the TeX math syntax is much more pleasant than the eqn
one. is there a performance/simplicity reason to that? if not so:
is there something like a tex2eqn so i can maintain tex equations
instead of eqn ones?

regards,
marc