"Chris Mungall" . . _:b1214661 . _:b1214660 . _:b1214659 . "x existence starts during y if and only if the time point at which x starts is after or equivalent to the time point at which y starts and before or equivalent to the time point at which y ends. Formally: x existence starts during y iff \u03B1(x) >= \u03B1(y) & \u03B1(x) <= \u03C9(y)." . _:b1214659 . . _:b1214662 . _:b1214662 . _:b1214660 . _:b1214661 . _:b1214660 _:b1214659 . "existence starts during" . . _:b1214662 _:b1214661 .