# Release v0.14.0
## Features
- `functions` module
- Added `pow` function.
- Added Bessel functions.
- `linear` module
- Implemented GMRES (with preconditioning).
- Added preconditioning to BiCGSTAB.
- Implemented a class to estimate diagonal elements of matrices.
- `ode` module
- Implemented some additional formulas:
- Radau IIA method of order 3, 5, 7, and so on.
- Lobatto IIIC method of order 4 and 6
- Crank-Nicolson method
- ESDIRK 3/2
- SDIRK6
- ROS34PRw
- ROS3PRL2
- ROS3Dw
- Added helper classes to solve time-dependent PDEs using the method of lines.
- Added support for mass matrices and sparse Jacobian matrices in some implicit formulas.
- Added support for ODEs without Jacobian matrices in some implicit formulas.
- Added some new methods for automatic step size control.
- `polynomials` module (New)
- Implemented a class of polynomials with some operations.
- `rbf` module
- Implemented RBF-FD (Radial Basis Function Finite Difference) method.
- Implemented derivatives of polyharmonic splines.
- Implemented the polyharmonic operator.
- Added constants to distinguish between positive definite RBFs and RBFs which are not positive definite.
- Added support for non-positive-definite RBFs in RBF interpolators.
- Implemented arithmetic operations of operators.
- Implemented Bessel RBF and Matern RBF.
- `util` module
- Added more helper functions in `vector_view` class.
- Added utility functions for `Eigen::Triplet`.
- Added a function to generate rectangle boundary nodes without corners.
## Improvements
- `ode` module
- Made implicit formulas faster by improving algorithms for solving equations in implicit formulas.
- Made implicit formulas aware of failures in linear solvers and convergence of Newton iterations.