Alternative Equation Formats

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MathML

\begin{aligned} C_{2, 1} (u_{1}, u_{2}, u_{3}, u_{4}) & = C_{2, 1} (C_{1, 1} (u_{1}, u_{2}), C_{1, 2} (u_{3}, u_{4})) \\ = ϕ_{2, 1}^{- 1} (ϕ_{2, 1} \circ ϕ_{1, 1}^{- 1} (ϕ_{1, 1} (u_{1}) + ϕ_{1, 1} (u_{2})) + ϕ_{2, 1} \circ ϕ_{1, 2}^{- 1} (ϕ_{1, 2} (u_{3}) + ϕ_{1, 2} (u_{4}))) \end{aligned}

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Math as LaTeX Source

\begin{align*} C_{2,1}(u_1,u_2,u_3,u_4) & = C_{2,1}\left(C_{1,1}(u_1, u_2),C_{1,2}(u_3, u_4)\right) \\ & =\phi ^{-1}_{2,1}\left(\phi _{2,1}\circ \phi ^{-1}_{1,1}\left(\phi _{1,1}(u_1)+\phi _{1,1}(u_2)\right)+\phi _{2,1}\circ \phi ^{-1}_{1,2} \left(\phi _{1,2}(u_3)+\phi _{1,2}(u_4)\right)\right) \end{align*}