Retracted result on network equivalence reinstated
Solution to ‘graph isomorphism’ problem restored after error is found
![two graphs](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/01/011017_ec_isomorphic_free.png?fit=860%2C460&ssl=1)
CONNECT THE DOTS The graph isomorphism problem requires computers to quickly compare two graphs (shown) and determine if they are the same.
E. Otwell