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There is such a function, called qht(), in some of my work. For the whole context, see: ftp://ftp.cs.sjtu.edu.cn:990/sandy/maxwell/ Here's the central bit of code & comment: /* Quasi-Hadamard transform My own invention Goal is to mix a 32-bit object so that each output bit depends on every input bit Underlying primitive is IDEA multiplication which ...


It contains the equivalence classes represented by $\{1,\ldots,6\}$. To elaborate on Nova's comment below, $\mathbb{Z}_p$ is the collection of congruence classes when you divide by $p$. When $p=7$, two integers represent the same congruence class when they have the same remainder when divided by $7$. As you probably know, the only possible remainders are ...

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