Relation between continuant c and occurrent s, such that every instance of c comes into existing during some s.

x existence starts during y if and only if the time point at which x starts is after or equivalent to the time point at which y starts and before or equivalent to the time point at which y ends. Formally: x existence starts during y iff α(x) >= α(y) & α(x) <= ω(y).

Synonyms: begins_to_exist_during