Math node
The Math node performs various math operations between its inputs.

Inputs
The Math node accepts two grayscale inputs. Those inputs are optional, and when left unconnected, the corresponding parameter value is used
Outputs
The Math node generates a single grayscale texture that contains the result of the math operation.
Parameters
The Math node accepts the following parameters:
the operation to be performed
default values to be used in place of the inputs when left unconnected
a boolean that specifies if the result must be clamped between 0 and 1