Europe Factors to Watch-Shares set to fall after Greek election

PARIS, Jan 26 (Reuters) - European stocks were set to fall at the open on Monday, trimming some of last week's sharp gains on heightened concerns the Greek election results could lead to renewed instability in Europe. Greek leftist leader Alexis Tsipras promised that five years of austerity, "humiliation and suffering" imposed by international creditors were over after his Syriza party swept to victory in a snap election on Sunday. While Tsipras fell just short of an overall majority, he