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

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?

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  • Alan
    Lv 7
    2 months ago

    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
    2 months ago

    You could write a, d<0

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