I have a long fraction that doesn't fit on a page:
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\vec{u}_{i+1/2,j,k} = \left(u_{i+1/2,j,k}, \frac{v_{i,j-1/2,k}+v_{i,j+1/2,k}+v_{i+1,j-1/2,k}+v_{i+1,j+1/2,k}}{4}, \frac{w_{i,j,k-1/2}+w_{i,j,k+1/2}+w_{i+1,j,k-1/2}+w_{i+1,j,k+1/2}}{4} \right)
What I would like to do, is to split the numerator over two lines and get sth like that:
I tried to look for a solution but without any results so far.
Thanks in advance.