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what is the Limit Notation's code with many variables below of it?

What I need is exactly what depicted in picture below.

enter image description here

Red shoes
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1 Answers1

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\[:\enspace\liminf_{\substack{\tau\searrow 0 \\w'\to w}}\Delta_\tau^2f(\bar x\mid v)(w') \]

should be fine, although I don't see what the colon is here for..

Bernard
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