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# C/Fortran API

> PETSc C/Fortran API

> MPI Documentation

The manual pages are organized in four categories; we recommend beginning with basic functionality and then gradually exploring more sophisticated library features.

- Beginner - Basic usage

- Intermediate - Setting options for algorithms and data structures

- Advanced - Setting more advanced options and customization

- Developer - Interfaces intended primarily for library developers

- Main solver classes
  - Eigenvalue Problem Solver - EPS
  - Singular Value Decomposition Solver - SVD
  - Polynomial Eigenvalue Problem Solver - PEP
  - Nonlinear Eigenvalue Problem Solver - NEP
  - Matrix Function - MFN
  - Linear Matrix Equation - LME
- Auxiliary classes and system routines
  - Spectral Transformation - ST
  - Mathematical Function - FN
  - Region - RG
  - Direct Solver (or Dense System) - DS
  - Basis Vectors - BV
  - SLEPc System Functions
- Single Index of all SLEPc Manual Pages
  - B
  - D
  - E
  - F
  - L
  - M
  - N
  - P
  - R
  - S
  - V