Abstract
We present a theory of even functionals of degree k. Even function als are homogeneous polynomials which are invariant with respect to permutations and reflections. These are evaluated on real symmetric matrices. Important examples of even functionais include functions for enumerating embeddings of graphs with k edges into a weighted graph with arbitrary (positive or negative) weights and computing kth moments (expected values of kth powers) of a binary form. This theory provides a uniform approach for evaluating even functionais and links their evaluation with expressions with matrices as operands. In particular, we show that any even functional of degree less than 7 can be computed in time O(n ω), the time required to multiply two n × n matrices.
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© 1993 Springer-Verlag Berlin Heidelberg
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Jaromczyk, J.W., Świcatek, G. (1993). A theory of even functionals and their algorithmic applications. In: Lingas, A., Karlsson, R., Carlsson, S. (eds) Automata, Languages and Programming. ICALP 1993. Lecture Notes in Computer Science, vol 700. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-56939-1_67
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DOI: https://doi.org/10.1007/3-540-56939-1_67
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