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The triple product rule in multivariable calculus is widely used. Can a quadruple product rule equation be written for an equation f(x,y,z,z2)=0?

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    What is the triple product rule?2012-04-23
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    @Qiaochu: http://en.wikipedia.org/wiki/Triple_product_rule2012-04-23
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    If you follow the argument given in that wikipedia page, and if I understamnd correctly what you want, you can easily see what the *quadruple product rule* is.2012-04-23

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