What does the inverted V represent in math

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I know that A V B represents Logical disjunction which means A OR B and the result of it is false only when both A and B are false . But I still didn't understand what an inverted V means as shown in the image below. I know that cij , ail and blj are cells in a matrix but I dont understand the meaning on the whole. Can someone please help.

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2 Answers

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It is very common for $\wedge$ to be used when one considers differential $k$-forms. This is not it, though. It's logical AND.

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For your context I think Conjunction or AND

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