A double inequality is an inequality where there are two signs, as opposed to one.
Ex: an inequality could be 3x < 15
A double inequality could be 3x < 15 < x + 20
If you'd want to solve that double inequality, you split it into to expressions:
3x < 15 and x + 20 > 15
Then just solve.
x < 5 and x > -5
-5 < x < 5
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Some signs of inequality may be physical or emotional differences.
In mathematics, an inequality is a statement about the relative size or order of two values.
When a quantity is subtracted or added from both sides of an inequality, the true difference in value is varied thereby changing the direction of the inequality, but when rather than subtracted or added it is multiplied or divided, it preserves the true difference in value thereby facing the same direction as the initial inequality.
Not the same as, or different from.
Less than or equal to. :)