Three observers agreeing now is the same operation as one observer persisting across three moments. 3 is the minimum for majority vote. 3 is the minimum for braiding.
Three tests. Equivalence shows convergence. Stacking creates meta-structure. Nesting propagates majority upward.
3 is the minimum for non-trivial braiding. Two strands merely twist; three strands weave. The braid group B_3 is infinite and non-abelian.
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