Nonexistence of a geometric progression that contains four triangular numbers.
Fang, Jin-Hui (2007)
Integers
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Nonexistence of a geometric progression that contains four triangular numbers.
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We study a two-grid scheme fully discrete in time and space for solving the Navier-Stokes system. In the first step, the fully non-linear problem is discretized in space on a coarse grid with mesh-size and time step In the second step, the problem is discretized in space on a fine grid with mesh-size and the same time step, and linearized around the velocity computed in the first step. The two-grid strategy is motivated by the fact that under suitable assumptions,...