Abstract base class for function which are differentiated using the chain rule.
Differentiates a division with respect to a variable.
Differentiates functions like
Rules are specified by an expression string or a trees of nodes.
For functions defined by expressions this rule automatically calculates the derivative.
Differentiates a product with respect to a variable. diff(y*z,x) -> diff(y,x)*z+y*diff(z,x)
Rules like Sum where diff(sum(a,b,c),x) -> sum(da/dx,db/dx,dc/dx) are instance of this class.
Differentiates a power
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