What's the correct mathematical expression for a

Question

Assume that in an algebraic equation is true for a>0, d>0. But if a<0 and d<0 at the same time, then this algebraic equation is also true, what's the correct mathematical expression for a<0 and d<0 at the same time in an equation?

Alan · Answer

mathematically , both "and" and "⋂" mean the
intersection of two equations.
If you don't know whether a> d or d> a, then

(a < 0) and (d < 0)

(a<0) ⋂ (d<0)

If a and d are constants and you know whether
a > d, then it simplifies to d<0
or
if you know d>a , then it simplifies to a<0

Anonymous · Answer

You could write a, d<0

What's the correct mathematical expression for a<0 and d<0 at the same time in an equation?

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