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that utilizes the symmetry, such as, for example, SymmLQ, which is also
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step_24 "step-24": If you read the above formulas closely, it becomes clear
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that the velocity $V$ only ever appears in products with the mass matrix. In
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@ref step_23 "step-23" and @ref step_24 "step-24", we were, therefore, a bit
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step-23 and step-24, we were, therefore, a bit
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wasteful: in each time step, we would solve a linear system with the mass
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matrix, only to multiply the solution of that system by $M$ again in the next
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time step. This can, of course, be avoided, and we do so in this program.