Module containing the central
Envelope class, which represents a piece-wise exponential function.
Envelopes support arithmetic operations like addition, subtraction, multiplication, and division. They
also support horizontal scaling and shifting.
Note also that this is defining a function whose domain is a portion of the real number line, but whose range can actually be nearly anything, including, e.g., numpy arrays. All of the functionality, even integration, works for mappings onto other kinds of ranges.
Class representing a piece-wise exponential function.