How can I type equations as the following format?

enter image description here



% without labels for different case which I need

A & \Longrightarrow B \tag{1} \\
& \Longrightarrow 

G_{11}=G^{t}          &z \in C_1, z' \in C_1 \\
G_{12}=G^{<}          &z \in C_1, z' \in C_2 \\
G_{13}=G^{\rceil}     &z \in C_1, z' \in C_3 

% another unsucessful try 
A & \Longrightarrow B \tag{1} \\
& \Longrightarrow 

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up vote 6 down vote accepted

Very dirty and inelegant. Not to be used ;-)




a &\to{} &b \\
&&c \\
&\to{}&\smash{\left\{\begin{array}{@{}c@{}} \mathstrut \\ \mathstrut \\ \mathstrut \end{array}\right.} d \\


enter image description here

Explanation: {alignat}{2} makes two pairs of rl columns, so it is basically equivalent to an array with rlrl alignment. In the first, right-aligned column I put a; in the second, left-aligned column the two arrows; in the third, right-aligned column the brace and the other letters; the fourth column is empty.

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