greek characters

[Paolo M]

The following LyX setup
document->settings-> language->encoding type    'traditional
(auto-selected)'

yields the expected pdf view, showing greek character \pi
(by the way, where do the line appearing on top come from? )

while setting
document->settings-> language->encoding type    'Unicode (utf8)'
exporting to pdf yields:
----
LaTeX Error: Unicode character π (U+03C0)

Description:
\textgreek{π}

You may provide a definition with

\DeclareUnicodeCharacter

----


MWE included
thank you
p.
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