Bundles

A cylinder cylinder!as product is the product product of an interval and a circle because it is both an interval of circles and a circle of intervals (Figure 17.1). (For a review of products, see Chapter 6.) Figure 17.1 A cylinder is both an interval of circles and a circle of intervals. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315162553/62c08cec-39ea-4661-8824-40f68df44351/content/fig17_1.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/>