[NTG-context] Defining mathsymbols from unicode char

[Jethro Djan <jthryeboah@gmail.com>]

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Dear all,

1. I am trying to define the "pitchfork" unicode character(
https://unicodeplus.com/U+22D4) to use in ConTeXt as stated on page 387 of
new math manual authored by Hans and Mikael:
\definemathsymbol[pitchfork][relation]["22D4]

It works with some unicode characters and not others (like this character).
What can I do to make it work?

2. I would like a \not\perp symbol but it doesn't draw the stroke on top of
the symbol. I know you could manipulate this in a plain TeX but I am
thinking the mechanism in ConTeXt would be different. How can I achieve
this? Also how can I get the \notperp symbol in the accepted answer of
https://tex.stackexchange.com/questions/27651/symbol-about-not-orthogonality-in-latex
?

Thanks.

Jethro

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