We give a short and elementary proof that the first hitting time of an open set by the jump process of a c\`adl\`ag adapted process is a stopping time.
An elementary proof that the first hitting time of an $F_σ$ set by a jump process is a stopping time
A Short and Elementary Proof of the Central Limit Theorem by Individual Swapping
On the expectation of normalized Brownian functionals up to first hitting times
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