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Hello Operator (Posted on 2003-10-17)

Difficulty: 4 of 5

Consider a binary operation # that is closed under the set of integers (if a and b are integers, then a#b is an integer).

Assume that, for all integers a and b, it is true that (a#b)#a=b.

Prove that a#(b#a)=b.

See The Solution Submitted by DJ

Rating: 4.2727 (11 votes)

Comments: ( You must be logged in to post comments.)

	Subject	Author	Date
	Repeat (simple solution)	Gamer	2010-08-26 01:01:23
	re: freaky solution	Brian Smith	2003-10-29 13:12:08
	freaky solution	Victor Zapana	2003-10-29 10:33:39
	re: My solution	Brian Smith	2003-10-21 11:05:20
	My solution	Ashlee	2003-10-21 05:32:09
	re(8): A simple solution	SilverKnight	2003-10-20 12:33:51
	re(7): A simple solution	DJ	2003-10-20 11:59:28
	re(6): A simple solution	SilverKnight	2003-10-20 03:48:46
	re(5): A simple solution	DJ	2003-10-20 02:18:01
	re(4): A simple solution	SilverKnight	2003-10-20 01:14:35
	re(3): A simple solution	SilverKnight	2003-10-20 01:05:22
	re(3): A simple solution	DJ	2003-10-19 22:08:41
	re(2): A simple solution	Charlie	2003-10-19 13:25:13
	re: A simple solution	SilverKnight	2003-10-19 13:22:39
	A simple solution	Angela	2003-10-19 11:15:50
	re: full solution	iggyb387	2003-10-17 20:55:06
	another way to describe it	Charlie	2003-10-17 15:07:18
	point of interest	SilverKnight	2003-10-17 14:58:38
	full solution	SilverKnight	2003-10-17 14:48:15

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