I want to generate the cases in the picture. However, the Symbols T1, T2 on LHS and RHS are different in size.

enter image description here

\documentclass[a4paper, 12pt]{report}


  (\mathcal{T}_{1},  \mathcal{T}_{2})=
\frac{\left|\mathcal{T}_{1} \cap  \mathcal{T}_{2}\right|}{Min\ 
    {\left|\mathcal{T}_{1}\right|, \left|\mathcal{T}_{2}\right|\} } &  
       negative~test, \\
    -1 & positive~test 

1 Answer 1


You can either set the \fraction using \displaystyle (via \dfrac), or use dcases. The latter provides a better solution since it results in better vertical spacing.

enter image description here




  (\mathcal{T}_1, \mathcal{T}_2) = \begin{dcases}
    \frac{| \mathcal{T}_1 \cap \mathcal{T}_2 |}
      {\min\{| \mathcal{T}_1 |, | \mathcal{T}_2 |\}} &  
      \text{negative test}, \\
    -1 & \text{positive test}

  • In this case dcases* seems appropiate.
    – Manuel
    Commented Nov 11, 2018 at 8:58

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