W(Φ) = \left \Vert \array{
{ φ \over ({φ}_{1},{ε}_{1})} & 0 &\mathop{\mathop{…}}\kern 1.66702pt & 0 \cr { φ{k}_{n2} \over ({φ}_{2},{ε}_{1})} &{ φ \over ({φ}_{2},{ε}_{2})} &\mathop{\mathop{…}}\kern 1.66702pt & 0 \cr .&.&.&.&. \cr { φ{k}_{n1} \over ({φ}_{n},{ε}_{1})} &{ φ{k}_{n2} \over ({φ}_{n},{ε}_{2})} &\mathop{\mathop{…}}\kern 1.66702pt &{ φ{k}_{n\kern 1.66702pt n−1} \over ({φ}_{n},{ε}_{n−1})} &{ φ \over ({φ}_{n},{ε}_{n})} } \right \Vert |
Source from the testmath file of AMS [5].