In Persona 3 Portable, when you and your party can split up to explore a tower floor more quickly, do your team mates still gain experience when they have battle encounters on their own? Iam talking about your team-mates, not your personae
Yes, they do gain the experience. However, I never personally employed this tactic and kept my party together as often as possible.
This. Generally you don't want to leave your party members the chance to get themselves killed and the xp from solo fighting is not worth the bother if one dies.