Thus the average time of reaction, Tavg, can be approximated by summing up the times taken for a successful reaction by the first collision, or that by the second collision and so on.
It was the first collision since The Collision.
If the first collision fails to produce a reaction, they collide again after Δt time units and so on.
Besides Atlas, three other detectors at the LHC, namely CMS, Alice and LHCb, recorded their first collisions on Tuesday.
On first exposure the collision of oddball aspiration with old-fashioned showbusiness determination to entertain is dynamite, but it reveals its richness over time.
But a handful of hits to players' heads within a few hours last Sunday, one day after a Rutgers player was paralyzed by a helmet-first collision, concentrated attention on the danger that the N.F.L. wants to eliminate.
On 12 December, Australia was involved in a second collision, this time with the battlecruiser.
Hamilton and Rosberg are nowhere near that level of acrimony but it is interesting, at least, that it has taken less time for them to have their first on-track collision than it did Senna and Prost.
Some have likened today's negotiations to a game of chicken, in which the loser is whichever of two cars on a head-on collision course swerves first.
There's a vibrancy - a force - about the place that comes, I suspect, from the head-on collision between first and third world.
