Matrix-Free Linear Operators with SciMLOperators.jl

SciML has the SciMLOperators.jl library for defining linear operators. The ODE solvers will specialize on this property, for example using the linear operators automatically with Newton-Krylov methods for matrix-free Newton-Krylov optimizations, but also allows for methods that require knowing that part of the equation is linear, like exponential integrators. See the SciMLOperators.jl library for more information.