"book-pflow-xyz/chapters/appendix-d-glossary.md" . . "A state where all derivatives are approximately zero — the system has stopped changing. go-pflow's `SolveUntilEquilibrium` stops early once the largest absolute derivative stays below a tolerance (default $10^{-6}$) for several consecutive checks (`solver/equilibrium.go`; Appendix A)."@en . . "Equilibrium"@en .