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comment Function to calculate finite difference
@user21 Great - thanks. That's a valuable resource, I think.
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comment Function to calculate finite difference
To answer your question, check the documentation (not very easy to find online): tutorial/NDSolveMethodOfLines - explicit formulas are above the heading for FiniteDifferenceDerivative. Maybe this should be closed as "easily found in the documentation" - but it's not that easy to find, so I could also post an answer if needed (or even better: answer your own question).
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reviewed Close Parallelization and memoization?
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reviewed Close Import (of linux mathematica9) crashes after importing large nasacdf file(~50M)
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reviewed Close 1D FDTD lens simulation
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reviewed Close cteq5 mathematica
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reviewed Close webMathematica - MathLink linkname missing or malformed
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reviewed Close Mathematica 10 Linux - no symbols when exporting in PDF
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revised Composition of Multivariable function
formatting
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answered Composition of Multivariable function
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comment What are the steps using boolean algebra for transforming one equation into another?
Ah, sorry but that's not possible with built-in functions. You can only do it in a single step: BooleanConvert[Ykmin] gives you Ydmin except in a different order.
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comment What are the steps using boolean algebra for transforming one equation into another?
Now the question does make sense for this forum. Not a complete answer, but a way to verify this problem is simply this: Simplify[Equivalent[Ydmin, Ykmin]] and the result indeed is True.
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comment Getting an InterpolatingFunction from a ContourPlot
@Lou thanks - I saw there was a duplicate question just now, and marked it as such...
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comment What are the steps using boolean algebra for transforming one equation into another?
Could you please post the Mathematica code that you've already tried. Your equations aren't in Mathematica syntax.
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awarded  Nice Answer
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answered How do I add contour labels to contour plot?
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reviewed Close Calculating a Volume Integral limited by two z planes and a given conical surface
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reviewed Close What extrapolation method does Interpolation use by default?
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reviewed Close Finding the number that gives remainder equal to 0
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reviewed Close app keeps minimizing when switching in windows 8