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Consistent and inconsistent equations
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Consistent and inconsistent equations : ウィキペディア英語版
Consistent and inconsistent equations
In mathematics and in particular in algebra, a linear or nonlinear system of equations is consistent if there is at least one set of values for the unknowns that satisfies every equation in the system—that is, that when substituted into each of the equations makes the equation hold true as an identity. In contrast, an equation system is inconsistent if there is no set of values for the unknowns that satisfies all of the equations.
If a system of equations is inconsistent, then it is possible to manipulate and combine the equations in such a way as to obtain contradictory information, such as 2 = 1, or ''x''3 + ''y''3 = 5 ''and'' ''x''3 + ''y''3 = 6 (which implies 5 = 6).
Both types of equation system, consistent and inconsistent, can be any of overdetermined (having more equations than unknowns), underdetermined (having fewer equations than unknowns), or exactly determined.
==Simple examples==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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