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 Sep16 comment Congruence modulo n where one side is equal to 1 OK thanks, I just found the terminology and formulation used in the book quite confusing. Sep16 accepted Congruence modulo n where one side is equal to 1 Sep15 comment Congruence modulo n where one side is equal to 1 Let me quote the book: Two numbers are said to be congruent modulo n if they both have the same remainder when divided by n. The remainder of a number a when divided by n is also referred to as the remainder of a modulo n, or simply as a modulo n. So as far as I understood it, they're saying that $a^{n-1}$ and $1$ are congruent modulo $n$, which means that they have the same remainder when divided by $n$. So I'm not sure in your answer... Sep15 asked Congruence modulo n where one side is equal to 1 Jul2 awarded Curious Jun13 awarded Nice Question May10 comment Can I keep adding more dimensions to complex numbers? For R3 you simply define a number j that has the property j^3 =− 1. - isn't that -1? Mar14 comment Any natural number is greater than or equal to its product of digits. @Hawk I misread the question as "lower than or equal to" - sorry! Mar14 comment Any natural number is greater than or equal to its product of digits. I don't get this. If a number has 0 as a digit, wont its product of digits also be 0? Dec30 awarded Notable Question Dec8 awarded Notable Question Sep7 awarded Popular Question Mar20 awarded Popular Question Feb27 accepted Can true randomness come out of mathematical rules? Feb27 accepted Can I keep adding more dimensions to complex numbers? Dec5 awarded Yearling Oct4 awarded Nice Question Sep22 awarded Editor Sep22 revised Can I keep adding more dimensions to complex numbers? added 67 characters in body Sep22 comment Can I keep adding more dimensions to complex numbers? How can you loose those? Wow, I really need to research into this...