Good discussion on this at https://old.reddit.com/r/askmath/comments/10a2xmc/do_corners_exist_in_math_help_me_settle_a_debate/ https://old.reddit.com/r/askmath/

Good discussion on this at https://old.reddit.com/r/askmath/comments/10a2xmc/do_corners_exist_in_math_help_me_settle_a_debate/ https://old.reddit.com/r/askmath/comments/10a2xmc/do_corners... One of the requirements is that you have to clearly define whether your n-dimensional object is a solid.