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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)
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)
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