Abstract
Some of my favorite open problems concern fixed-point logic with counting, FPC. It is known that counting logic with k + 1 variables, C k +1 , has exactly the same expressive power as the classic k-dimensional Weisfeiler-Leman Algorithm, k -WL. Furthermore, the quantifier-depth of a C k +1 formula needed to express the color of a k -tuple of vertices is equal to the number of iterations of k -WL needed to derive that color.
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