Symbol f
f is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
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Why this formula appears here
Working through the statistical mechanics of a wall permeable to solvent but not to suspended particles, Einstein arrived at a differential equation for how the concentration f(x,t) of particles along one axis changes over time:
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Symbol x
x is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
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t is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
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Published contexts (1)
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Equation 1 · Einstein & Evolution
Einstein's Random Walk and the Mathematics of Genetic Drift
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.
Working through the statistical mechanics of a wall permeable to solvent but not to suspended particles, Einstein arrived at a differential equation for how the concentration f(x,t) of particles along one axis changes over time:
Equation guide → · Article →