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If x and f are quantities then xf and fx are the same if they belong to a commutative space. If not, they normally do not. Multiplication of matrices, for example is cont commutative. In fact, it is quite possible that xf has a value but fx does not even exist.

if x and f are functions then again, fx and xf will not generally be the same.

For example suppose x = "add 5 to it" and f = "square it".

Then xf(3) = x(9) = 14

while fx(3) = f(8) = 64

Q: What is xf compared to fx How are they different?

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fx=5x1 / 9

if x is compact, you are simply multiplying the compact number, therefore, 'fx' will also be compact.

loot at heresupport.casio.com/pdf/004/fx-115ES_991ES_Eng.pdf

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It depends on whether fx denotes frequency times variable value or the probability generating function for the variable x.

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The 2011 Jaguar XF has 32 valves.

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