An infinite net is made of identical wires. The resistance between points 1 and 2 is r, and the resistance between points 1 and 3 is R. Find the resistance R14 between points 1 and 4.
We received many solutions to our January Challenge, Lore of the rings. We are pleased to recognize the following successful solvers:
Salvatore Basile (Università degli Studi di Palermo, Palermo, Italy)
Philip Blanco (Grossmont College, El Cajon, CA)
Phil Cahill (The SI Organization, Inc., Rosemont, PA)
Don Easton (Lacombe, Alberta, Canada)
Arunangshu Karmakar, student (Salt Lake School, Kolkata, India)
Stephen McAndrew (Sydney, Australia)
Matthew W. Milligan (Farragut High School, Knoxville, TN)
Daniel Mixson (Naval Academy Preparatory School, Newport, RI)
Steven Morris (emeritus, Los Angeles Harbor College, Wilmington, CA)
Carl E. Mungan (U. S. Naval Academy, Annapolis, MD)
Pascal Renault (John Tyler Community College, Midlothian, VA)
Randall J. Scalise (Southern Methodist...