On 12/15/2011 6:04 AM, rusi wrote:
On Dec 15, 3:58 pm, Chris Angelico<ros...@gmail.com> wrote:
On Thu, Dec 15, 2011 at 9:47 PM, Robert Kern<robert.k...@gmail.com> wrote:
42 = 2 mod 5
2 = 42 mod 5
It might make more sense to programmers if you think of it as written:
42 = 2, mod 5
2 = 42, mod 5
Better, using ascii text, would be
42 =mod5 2
where =mod is a parameterized equivalence relation that is coarser than
= (which is =mod-infinity). divmod(a,inf) = 0,a.
=mod1 is the most coarse relation in that it make every count
equivalent. divmod(a,1) = a,1.
For the record I should say that the guy who taught me abstract
algebra, said about as much:
He said that the notation
a == b mod n
should be written as
a ==n b
(read the == as 3 horizontal lines and the n as a subscript)
The 3 horizontal line symbol is often used for equivalence relations
other than =.
--
Terry Jan Reedy
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