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  2. Courant–Friedrichs–Lewy condition - Wikipedia

    en.wikipedia.org/wiki/Courant–Friedrichs–Lewy...

    The principle behind the condition is that, for example, if a wave is moving across a discrete spatial grid and we want to compute its amplitude at discrete time steps of equal duration, [2] then this duration must be less than the time for the wave to travel to adjacent grid points. As a corollary, when the grid point separation is reduced ...

  3. Sodium laureth sulfate - Wikipedia

    en.wikipedia.org/wiki/Sodium_laureth_sulfate

    Sodium laureth sulfate (SLES), an accepted contraction of sodium lauryl ether sulfate, also called sodium alkylethersulfate, is an anionic detergent and surfactant found in many personal care products (soaps, shampoos, toothpaste, etc.) and for industrial uses.