# linear-solver Specification

## Purpose
TBD - created by archiving change improve-convergence-algorithms. Update Purpose after archive.
## Requirements
### Requirement: AdvancedLinearSolver Enhancement

The existing AdvancedLinearSolver SHALL be enhanced with the new optimization features.

#### Scenario: AdvancedLinearSolver with KLU

- **GIVEN** AdvancedLinearSolver configured with Backend::Auto
- **WHEN** KLU is available
- **THEN** KLU is used for all solves
- **AND** symbolic caching is enabled by default

#### Scenario: Backward compatibility

- **GIVEN** existing code using AdvancedLinearSolver
- **WHEN** no options are specified
- **THEN** behavior is compatible with previous version
- **AND** new optimizations are applied transparently

