from Hacker News

The Algebra of an Infinite Grid of Resistors

by gone35 on 6/15/25, 5:47 AM with 9 comments

• by Koshkin on 6/15/25, 1:27 PM

  > we imagine injecting 1 amp of current into a single node

  I have always had a problem with statements like this. Current is a (measurable) property of an edge, not a node (vertex). One can’t “inject” current into “a single node."

• by ColinWright on 6/15/25, 9:09 AM

  See also: https://news.ycombinator.com/item?id=44279181

• by fh973 on 6/15/25, 11:54 AM

  See also: https://xkcd.com/356/