*Last updated: 2023-03-16.*
# tf_quant_finance.math.pde.steppers.extrapolation.extrapolation_step
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Creates a stepper function with Extrapolation time marching scheme.
```python
tf_quant_finance.math.pde.steppers.extrapolation.extrapolation_step()
```
Extrapolation scheme combines two half-steps and the full time step to obtain
desirable properties. See more details below in `extrapolation_scheme`.
It is slower than Crank-Nicolson scheme, but deals better with value grids
that have discontinuities. Consider also `oscillation_damped_crank_nicolson`,
an efficient combination of Crank-Nicolson and Extrapolation schemes.
#### Returns:
Callable to be used in finite-difference PDE solvers (see fd_solvers.py).