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We study compactifications of F-theory on certain Calabi-Yau threefolds. We find that N = 2 dualities of type II/heterotic strings in 4 dimensions get promoted to N = 1 dualities between heterotic string and F-theory in 6 dimensions. The six-dimensional heterotic/heterotic duality becomes a classical geometric symmetry of the Calabi-Yau in the F-theory setup. Moreover the F-theory compactification...
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