[petsc-users] Solve Linear System with Field Split Preconditioner

[晓峰 何]

Hello Jed,

The saddle point is due to Lagrange multipliers, thus the size of A11 is much smaller than A00.



Best Regards,

Xiaofeng


On Sep 26, 2022, at 21:03, Jed Brown <jed at jedbrown.org<mailto:jed at jedbrown.org>> wrote:

Lagrange multipliers

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