Question: solve using assume option

how can solve using assume option ?

restart:

F(z):=m*z^4-4*m*z^3+(3*m+3)*z^2-6*u;

m*z^4-4*m*z^3+(3*m+3)*z^2-6*u

(1)

solve(F(z),z assuming -0.5<m<0.5, 0<u<0.5)

Error, `<` unexpected

 

 

 

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