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[tex]\delta[/tex][tex]\partial[/tex] (x) =[tex]\partial[/tex] [tex]\delta[/tex] (x)

where delta is just the variation. Someone asked me why thats true and i guessed the only thing i could say was that delta is an operation not a variable so this is more like an algebraric statment of the commutivity of delta and taking a derivative. Is this right or is there a more clear explanation.