hi, i want to solve these 4 equations and i have two problems
1-when i use the function SOLVE , the output is empty brackets, why?
2-how can i add constrains or inequalities to make maple consider them in the solution
the solve line is
solve({e^(-z[11]/t[1])*(p[21]*e^(-z[21]/t[1])+p[22]*e^(-z[22]/t[2])) = t[1]*(1-w-u[11])/(w*p[11]), e^(-z[12]/t[2])*(p[21]*e^(-z[21]/t[1])+p[22]*e^(-z[22]/t[2])) = t[2]*(1-w-u[12])/(w*p[12]), e^(-z[21]/t[1])*(p[11]*e^(-z[11]/t[1])+p[12]*e^(-z[12]/t[2])) = t[1]*(1-w-u[21])/(w*p[21]), e^(-z[22]/t[2])*(p[11]*e^(-z[11]/t[1])+p[12]*e^(-z[12]/t[2])) = t[2]*(1-w-u[22])/(w*p[22])}, [z[11], z[12], z[21], z[22]])
and the constrains that i want maple to consider are
u[11].z[11] = 0
u[12].z[12] = 0
u[21].z[21] = 0
u[22].z[22] = 0
z[11] >= 0
z[12] >= 0
z[21] >= 0
z[22] >= 0
u[11] >= 0
u[12] >= 0
u[21] >= 0
u[22] >= 0
i tryed to add these constrains to the solve line as othe equations but maple still gives me empty brackets
plz help me
