From Mr. V Wiki Math
Lecture
Lecture Notes
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Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle D=\{\forall x | x \in \Re, x\neq 1\} }
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