It has been dubbed the "Zeroth" law, as opposed to the "First", breaking standard list naming conventions to illustrate the point of how fundamental this law is. Without the Zeroth law, all the other Three laws of Thermodynamics would become completely invalidated. Thus the first law; systems in equilibrium being equal, being an assumption one would make through common sense - underpins the First, Second, and Third laws - as the Zeroth law of Thermodynamics.
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