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Recently, Rips produced an example of a double of two free groups which has un-solvable generalized word problem. In this paper, we show that Rips's example fits into a large class of doubles of groups, each member of which contains F 2 × F 2 and therefore has unsolvable generalized word problem and is incoherent. By a result of Mihailova every group which(More)
Technology is universal and omnipresent. It has reshaped the way we function. One of the best ways to incorporate technology in the classroom is as a tool to facilitate learning by using it as a visual aid. This is a type of teaching and learning style in which ideas, concepts, data and other information are associated with images and techniques. In this(More)
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