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 Description  
 Trichotomy Law:  For any real number, a, a>0, a=0 or a<0.
This law is used to compare real numbers to 0. A real number can be greater than 0, equal to 0 and less than 0. A number can only be put into one of those three categories. This law can be appled to other numbers other than 0. The law would then be written, for two real numbers, a and b, either a>b, a=b, or a