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In Desmos, a simple piecewise expression (or "restriction") like {a>0} returns /1/, when it's true and /undefined/ when it's false. If you multiply multiple such restrictions the output will be /1/ when all of them are true and /undefined/ when at least one of them is false. This acts as an AND operator on the conditions.
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You can do an OR operation much easier but using a comma list in the restriction, e.g. {a>0,b>0} will be true if a>0 OR b>0.
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