Question: specifying boundary conditions with multiple subscripts

I need to specify some boundary conditions and I am unsure how to write it. My conditions are

F[m,n](1)=1,F[m,n](-1)=-1 if m=n=0 else F[m,n](1)=F[m,n](-1)=0  and F'[m,n](1)=0 and F'[m,n](-1)=0 for all m and n

how do i specify this?

Thanks

 

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