This study concerns numerical methods for efficiently solving the Richards equation where different weak formulations and computational techniques are analyzed. The spatial discretizations based on standard or mixed finite element methods. Different implicit semi-implicit temporal discretization of second-order accuracy studied. To obtain a linear system schemes, we propose using extrapolation ...

the topic of “trilogical denotations” (al-dalalat al-thalath) appears in avicenna logic system following the development of the discourse on “terms subject” (al-mabahith al-alfad) in his system. it was avicenna, who, for the first time, paid more attention to this subject and was responsible for its extended discussion. among the issues to which he addresses is the one on trilogical denotations...