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- Same pattern repeated every
`m`lines and every`m`columns. - Does not matter whether we compute with
`a`or with`a`+`m`,`a`-`m`,`a`+`i``m`, for any`i`in**Z**. - The elements of the set
[

cannot be distinguished from`a`]_{m}:= {`a`+`i``m`:`i`in**Z**}`a`by arithmetic modulo`m`.

*Can define modular arithmetic by equivalence classes.*

Author: Wolfgang Schreiner

Last Modification: January 12, 2000