 Łukasiewicz’s work was a source of inspiration to Reichenbach, and subsequently to de Finetti, both of whom put forward the idea expressed earlier by Ramsey that a conditional must be indeterminate when its antecedent is false (see Reichenbach 1935, 1944; de Finetti 1936). Reichenbach deems meaningless the evaluation of a conditional \(A&gt;B\) when \(A\) concerns some measurement rendered impossible by some other measurement (as predicted in quantum physics). For de Finetti, the idea is that a conditional sentence is like a bet. When someone bets that the card will be a king if it is a club, the bet should simply be called off if the card turns out to be of a different suit. On that basis, de Finetti proposed a table (sometimes called the “defective” conditional, see Baratgin et al. 2013, Over &amp; Baratgin 2017) for what he calls the logic of tri-events, where a tri-event refers to “the event \(B\) conditional upon event \(A\)”. The tri-event is true when both events are true, false when \(A\) is true and \(B\) false, and null if \(B\) is false.