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math.CO2011★ 2 cited
Chio Condensation and Random Sign Matrices
Peter Christian Heinig
This is to suggest a new approach to the old and open problem of counting the number f_n of Z-singular n x n matrices with entries from {-1,+1}: Comparison of two measures, none of…
math.CO2009
The Erdős bipartification conjecture is true in the special case of Andrásfai graphs
Peter Christian Heinig
Let the Andrásfai graph be defined as the graph with vertex set and two vertices and being adjacent iff $|i-j| \equiv 1\mo…