Q:

Resistor cube problem solving method

I was solving problems from Irodov when I came across the method called point of symmetry method. I cant find this method anywhere. So what is this method? Here is the link to the problem solution http://irodovphysicssolutionrks.blogspot.in/2013/12/problem3150_16.html

A:

The idea of the linked page is this: you can often find the equivalent resistance of certain highly symmetrical assemblies of resistors by adding "phantom" wires between points with equal potential. This has the advantage of giving quick, near-automatic answers without the use of Kirchhoff's laws, but it is very limited and works in very few cases.
This page explains it in (much!) better detail than the page in OP's link.

