Donald Hobson comments on Can Bayes theorem represent infinite confusion?

[Donald Hobson]

$P\left(E\right)=P\left(E|H\right)P\left(H\right)+P(E|!H)P(!H)=0\times 1+P(E|!H)\times 0$

In other words, the agent assigned zero probability to an event, and then it happened.