The differences between the Sao Khua dinosaur assemblage and the roughly coeval assemblages in China, notably those from the Jehol Group of NE China, have already been noted, and several hypotheses have been put forward, including differences in taphonomic conditions, and the existence of geographical or environmental barriers (Buffetaut et al. 2006; Fernandez et al. 2009).

The article first published online, then in print the next day.

Therein came into focus the far-reaching vision that the perspective of non-abelian fundamental groups could lead to a fundamentally new understanding of deep arithmetic phenomena, including the arithmetic theory of moduli and Diophantine finiteness on hyperbolic curves.

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