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# Automatic solvers and programmable tactics

Some tactics are largely automated and are able to solve complex goals. This chapter presents both built-in solvers that can be used on specific categories of goals and programmable tactics that the user can instrument to handle complex goals in new domains.

- Solvers for logic and equality
- Micromega: solvers for arithmetic goals over ordered rings
- ring and field: solvers for polynomial and rational equations
- Nsatz: a solver for equalities in integral domains
- Programmable proof search
- Generalized rewriting

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