Unfortunately, we can never be sure of nothing. Even if we did appear to perceive something from nothing we could not be certain that our something didn't arise from some other thing that resided within that nothing of which we have no concept.
Then there's the little problem that even if there...
DrClaude.
Thank you for your answer but unfortunately my mathematical abilities leave me stuck with classical conceptualism. In reply to the three, thought provoking, points that you make:-
Even if you can't define the position of a photon it must posses something akin to a probability density...
What's the interval between photons in stimulated emission?
In stimulated emission one photon induces the emission of a second photon whose coherence length, energy, polarisation and direction of travel are all identical to its own. There must be a delay between the two photons, see below, so...