I found that article quite confusing. I think these slides are clearer: https://courses.cs.washington.edu/courses/cse421/18au/lecture/lecture-8.pdf https://cour

I found that article quite confusing. I think these slides are clearer: https://courses.cs.washington.edu/courses/cse421/18au/lecture/lecture-8.pdf https://courses.cs.washington.edu/courses/cse421/18au/lectur... (provided you know about induction already.)