From experience you and I “know” that the world has a characteristic. For example, we play the game of tennis by following the “rules” or laws of physics. Otherwise, the game would not be very fun to play. We share the world which is “out there” from “in here”. And I understand the outside through the senses and the mind. I also understand the inside through the mind and its concepts and knowledge, and accordingly interact through my object, the body.
In this way, I have inducted (not deducted) that there is a world with independent objects and I am one of those objects.