Function mathml::petri_net::recognizers::recognize_leibniz_differential_operator

pub fn recognize_leibniz_differential_operator<'a>(
    numerator: &MathExpression,
    denominator: &MathExpression
) -> Result<(Operator, MathExpression), &'a str>

Check if fraction is a derivative of a single-variable function expressed in Leibniz notation, and if so, return a derivative operator and the identifier of the function.