*Last updated: 2023-03-16.*
# tf_quant_finance.math.pde.steppers.crank_nicolson.crank_nicolson_scheme
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Constructs the time marching scheme.
```python
tf_quant_finance.math.pde.steppers.crank_nicolson.crank_nicolson_scheme(
value_grid, t1, t2, equation_params_fn
)
```