A question for stochastic calculus

tennishaha
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The attachment is from Shreve's stochastic calculus book

In the attachment what does the symbol ^ mean?

Thanks
 

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It may be a wedge product, I am not sure :confused:
 
I've compared a couple of different books and it seems k^t means min(k,t) in this context. It is from the lattice of partially ordered set, and means infimum (greatest lower bound). Also known as the 'meet' of the elements in partially ordered set.
Someone should really clarify this please as I am getting curious as to why there are so many different notations and total disregard for the average mind
 

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