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# TSCN
ODE solver using the implicit Crank-Nicolson method.
## Notes
`TSCN` is equivalent to `TSTHETA` with Theta=0.5 and the "endpoint" option set. I.e.
```none
-ts_type theta
-ts_theta_theta 0.5
-ts_theta_endpoint
```
## See Also
[](ch_ts), `TSCreate()`, `TS`, `TSSetType()`, `TSBEULER`, `TSTHETA`, `TSType`,
## Level
beginner
## Location
src/ts/impls/implicit/theta/theta.c
## Examples
src/ts/tutorials/ex20adj.c
src/ts/tutorials/ex20opt_ic.c
src/ts/tutorials/ex20opt_p.c
src/ts/tutorials/ex20td.c
src/ts/tutorials/ex27.c
src/ts/tutorials/ex31.c
---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ts/impls/implicit/theta/theta.c)
[Index of all TS routines](index.md)
[Table of Contents for all manual pages](/manualpages/index.md)
[Index of all manual pages](/manualpages/singleindex.md)