[deal.II] How to determine the saddle-point nature of PDEs like those in Step-20, 21?

In Step-21 tutorial, we have a statement that starts with the following (emphasis is mine): *"Given the saddle point structure of the first two equations and their similarity to the mixed Laplace formulation we have introduced in step-20

Re: [deal.II] How to determine the saddle-point nature of PDEs like those in Step-20, 21?

On 3/11/20 7:57 AM, Krishnakumar Gopalakrishnan wrote: In Step-21 tutorial, we have a statement that starts with the following (emphasis is mine): /_"Given the saddle point structure_ of the first two equations and their similarity to the mixed Laplace formulation we have introduced in step-2

Re: [deal.II] How to determine the saddle-point nature of PDEs like those in Step-20, 21?

Dear Prof Bangerth. Thank you for your reply. I had seen that github issue/pull-request, but didn't realise that "saddle-point problems = (indefinite + symmetric)". These three words do not appear in close-proximity to each other anywhere in the slides, tutorials or video lectures. While I acknow

Re: [deal.II] How to determine the saddle-point nature of PDEs like those in Step-20, 21?

I had seen that github issue/pull-request, but didn't realise that "saddle-point problems = (indefinite + symmetric)". These three words do not appear in close-proximity to each other anywhere in the slides, tutorials or video lectures. While I acknowledge the importance of mathematical term