Combining constraints in a NLP

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I am trying to formulate a problem as a NLP, some of the constraints have the form " a> 0 and b > 0 and c > 0" I was wondering if there is a way to combine those constraints into a a single one : i.e. find a function f s.t. f(a,b,c)> 0 iff a >0 b>0 and c > 0. I appreciate your help