A mathematical sentence is the analogue of an English sentence; it is a correct arrangement of mathematical symbols that states a complete thought. Sentences have verbs. In the mathematical sentence '3+4=7 3 + 4 = 7 ' , the verb is '= '.
A mathematical sentence makes a statement about two expressions. A closed sentence is a mathematical sentence that is known to be either true or false. An open sentence in math means that it uses variables and is not known whether or not the mathematical sentence is true or false.
