Mixed finite-element approximations of linear boundary-value problems
Mixed finite-element approximations of linear boundary-value problems
A theory of mixed finite-element/Galerkin approximations of a class of linear boundary-value problems of the type <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper T asterisk upper T u plus k u plus f equals 0"> <mml:semantics> <mml:mrow> <mml:mi>T</mml:mi> <mml:mo>∗</mml:mo> <mml:mi>T</mml:mi> <mml:mi>u</mml:mi> <mml:mo>+</mml:mo> <mml:mi>k</mml:mi> <mml:mi>u</mml:mi> <mml:mo>+</mml:mo> <mml:mi>f</mml:mi> <mml:mo>=</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> <mml:annotation encoding="application/x-tex">T*Tu + …