Bounds on the Number of Bent Functions
One of the most important questions in the theory of bent functions is how many there are. If n is equal to 2, 4, 6, or 8, the number of bent functions in n variables is 8, 896, about 232.3, and about 2106.29, respectively. If n > 10, the exact number of bent functions in n variables is still unknown. Moreover, there is a large gap between the lower () and upper () bounds for this number. There have been several improvements of these bounds, but they are ...
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