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Mathematical Statements and Their Proofs
Mathematical Statements and Their Proofs

... Let a and b be two even integers. Since they are even, they can be written in the forms a = 2x and b = 2y for some integers x and y, respectively. Then, a + b can be written in the form 2x + 2y, giving the following equation: a + b = 2x + 2y = 2(x + y) From this, we see that a + b is divisible by 2. ...
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... 8. Talia was estimating the difference between two positive numbers x and y (where x > y). First she rounded x up by a small amount. Then she rounded y down by the same amount. Finally, she subtracted the rounded values. Which of the following statements is correct? Justify your answer(s). The diffe ...
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Mathematical model

A mathematical model is a description of a system using mathematical concepts and language. The process of developing a mathematical model is termed mathematical modeling. Mathematical models are used in the natural sciences (such as physics, biology, earth science, meteorology) and engineering disciplines (such as computer science, artificial intelligence), as well as in the social sciences (such as economics, psychology, sociology, political science). Physicists, engineers, statisticians, operations research analysts, and economists use mathematical models most extensively. A model may help to explain a system and to study the effects of different components, and to make predictions about behaviour.Mathematical models can take many forms, including but not limited to dynamical systems, statistical models, differential equations, or game theoretic models. These and other types of models can overlap, with a given model involving a variety of abstract structures. In general, mathematical models may include logical models. In many cases, the quality of a scientific field depends on how well the mathematical models developed on the theoretical side agree with results of repeatable experiments. Lack of agreement between theoretical mathematical models and experimental measurements often leads to important advances as better theories are developed.
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