Lecture 4a: Math. Analysis - Examples of bounded and unbounded d-cells

[@TheWombatGuru]

Where can I find a proof for R^d is unbounded?

[@alex-my8hp]

What is a d cell?

[@JoelFeinstein]

Hi, These are defined starting on Slide 15, after the discussion of intervals, rectangles and cuboids. The d-cells are the d-dimensional analogues of these. You could also think of them as hyper-cuboids, except that we do also allow unbounded d-cells, just as there are various types of unbounded interval in the real line. Some authors just call them d-dimensional intervals instead, but I prefer d-cell.