An arbitrary term, or placeholder. It is used in general proofs to indicate 'up to whatever desired maximum term'
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Mathematical modelling is the art of building mathematical objects, such as equations, shapes, or games, which share certain desired properties with observed phenomena. For instance
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If you want the nth term of this sequence, 0.2, 0.8, 3.2, 12.8, the nth term
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The differences between terms are 7,9,11,15. The differences of these differences are 2,2,2,2. Thus the formula for the sequence begins with n. 2. The sequence of numbers minus n.
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