Knowing an event obtains with probability one is interchangeable with absolute certainty
the verdict
REFUTED
the evidence says no
confidence 0/100
In probability theory, an event having a probability of one means it occurs 'almost surely,' which is distinct from absolute certainty when dealing with infinite sample spaces where zero-probability events can still occur.
Evidence against · 3
math.stackexchange.com: How likely/unlikely is an event with probability $1$/$0$?
cited by 0
Notes that an event with probability zero can still happen, contradicting interchangeability.
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More against · 2
math.stackexchange.com: What's the difference between almost surely and surely?
cited by 0
Explains the difference between 'surely' and 'almost surely' in infinite sample spaces.
en.wikipedia.org: Almost surely
cited by 0
Shows that an event of probability 1 can leave open non-empty sets, separating 'surely' from 'almost surely'.