Sorry John, the first post is right.
<m:degHide m:val="on" /> leads the correct root sign 
and 
<m:degHide m:val="1" /> leads a blank square on the left of root sign.
however in docx,<m:degHide m:val="1" />  leads the correct root sign.

I am sorry for my mistake.
在2023年9月12日星期二 UTC+8 02:38:16<John MacFarlane> 写道:

On Sep 11, 2023, at 5:26 AM, Yibotg <yib...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

Sorry , I made a mistake.
<m:degHide m:val="1" /> leads the correct root sign
and
<m:degHide m:val="on" /> leads a blank square on the left of root sign.

Well that's good, because pandoc produces m:val="1".
Perhaps you have an old version?


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