User blog comment:Wythagoras/Strength of Hierarchical Nested Subscript Array Notation/@comment-11227630-20130730115509/@comment-3427444-20130730153812

I found that Wythagoras changed it to [1 /[1[1~2]2] 2]. However, because [1~2] "drops down" to /, [1 /[1[1~2]2] 2] just becomes [1 /[1/2] 2], which level is higher than $$\vartheta(\Omega_{\Gamma_0})$$.

I guess the correct separator for level $$\vartheta(\Omega_{\Gamma_0})$$ is [1 /[1 [1[1/2~2]2] 2] 2], because [1[1/2~2]2] has level $$\Gamma_0$$.