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单词 redundant
释义
redundant

Mathematics
  • If an equation (or inequality) does not affect the solution set of other equations (or inequalities), it is said to be redundant. For example, if

    2x+y=7,3xy=3,5x+y=13,

    any one of these equations can be termed redundant because the other two are sufficient to identify x = 2, y = 3 as the only solution. If 3x+2y > 4 and 6x+4y > 9 then the first inequality is redundant because if 6x+4y>9 it follows that 3x+2y >4.5 and the first inequality is automatically satisfied. If one or more simultaneous linear equations are redundant, then in echelon form there will be a zero row.


Chemical Engineering
  • Superfluous to requirements such as an item of process plant that is no longer required or in operation. Compare mothballing.


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