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How could I create an array of an undertermined length? 

134.198.78.82 14:18, May 9, 2017 (UTC)

Huh?[]

I put the following code:

"
1 $$
2 \begin{array}{r|l}
3 [0] & 0 \\ [1] & 1 \\ [2] & 2 \\ [[0]] & \omega
4 \end{array}
5 $$
"

and an error popped up at line 3. Why?