The video loads from YouTube only after you press Play.

p adic numbers. Part 1 of 3: 10-adic integers.

A 36-minute video by Richard E Borcherds about mathematical reasoning, on the Mathematics shelf. It came up in r/math, in a thread called “What are some of your favorite math explainer videos that aren’t from mathologer, numberphile, or 3b1b?”.

Richard E Borcherds, Video, 36 min, 2020, on the Mathematics shelf

This is the first part of a 3-part talk on p-adic numbers for advanced high school students. It is part of a series organized by the Berkeley mathematics circle.