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Indeterminate equation is an important subject in number theory. Problems related to this topic can appear by itself or be part of other subjects. Simple indeterminate equations may appear in AMC8 level, but some challenging one can be tested in USAMO or even IMO level. Therefore, understanding how to solve indeterminate equations is a necessary skill for anyone who wants to perform well in math competitions. The book
Indeterminate Equation is dedicated on this topic.