Abstract
Two kinds of unconnected double fan graphs with even vertices,[see formula in PDF] and [see formula in PDF] [see formula in PDF] were presented. For natural number [see formula in PDF],[see formula in PDF],the two graphs are all graceful graphs, where [see formula in PDF] are even-vertices path,[see formula in PDF] is odd-vertices path,[see formula in PDF] are the complement of graph [see formula in PDF],[see formula in PDF] is the join graph of [see formula in PDF] and [see formula in PDF].
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