The probability of the emptyset is 0 [P(emptyset)=0]

[@user-cg7gd5pw5b]

P is a measure, measures are stable by complementarity, and by definition of a tribe and of a probability measure, P(omega)=1, therefore P(Null)=P(omega^c)=P(omega\omega)=P(omega)-P(omega)=0

[@015Fede]

So the probability that nothing happens is null?

[@snellbrosmath]

Exactly!

[@da_packster8390]

So this means that something always happens?

[@user-cg7gd5pw5b]

No, it means that there's always an outcome. That outcome can be 'nothing happens', but there is a result to the experiment (which can be anything like a coin toss or the survival of Schrödinger's cat). For example, if your experiment was "Will I suddenly be hit by an asteroid in the next five seconds", the probability of the event 'Nothing happens' is close to 1.