grouping and logical implication in math mode

How could I typeset a formula like this:

It shou开发者_JS百科ld respect typographic rules, but it must look very similar.

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You could use the aligned environment (requires the amsmath package), e.g.

\left. \begin{aligned}
   A &= T \\
   B &= F 
\end{aligned} \right\} \implies A \vee B = T \vee F = T

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(Assuming you meant to use logical disjunction and logical implication)

\[
\left.\begin{array}{l}
    A = T \\ B = F 
\end{array}\right\} 
\implies A \lor B = T \lor F = T
\]

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This code should do what you want:

\[ 
  \left.
  \begin{array}{c}
    A = T\\
    B = F
  \end{array}
  \right\}
  \Rightarrow A \vee B = T \vee F = T
\]