_preprocess_math(self, s)
If self is configured to use TeX, return s unchanged except that a single space gets escaped, and the flag "TeX".
Otherwise, if s is mathtext (has an even number of unescaped dollar signs) and parse_math
is not set to False, return s and the flag True.
Otherwise, return s with dollar signs unescaped, and the flag False.
Return the string s after mathtext preprocessing, and the kind of mathtext support needed.
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Using a canvas is more power efficient and can get hundred of nodes ; but does not allow hyperlinks; , arrows or text (beyond on hover)
SVG is more flexible but power hungry; and does not scale well to 50 + nodes.
All aboves nodes referred to, (or are referred from) current nodes; Edges from Self to other have been omitted (or all nodes would be connected to the central node "self" which is not useful). Nodes are colored by the library they belong to, and scaled with the number of references pointing them