From the PHB, Appendix A on Conditions: INVISIBLE An invisible creature is impossible to see without the aid of magic or a special sense. For the purpose of hiding, the creature is heavily ...
Invisibility and Stealth are one of the great cat & mouse games within Pathfinder. There are lots of ways to cancel Invisibility or Stealth, but it's not always clear if the opponent has them. So ...
When a creature is invisible but not hidden, one could argue that the players still know it's general location. If a creature becomes invisible and not hidden does it remain on the battle-mat?