Royen came to prominence in the spring of 2017 for a relatively simple proof for the Gaussian Correlation Inequality ( GCI ) which he had published three years earlier without much recognition .
The Gaussian Correlation Inequality ( GCI ) is a conjecture that originated in the 1950s .
Royen came to prominence in the spring of 2017 for a relatively simple proof for the Gaussian Correlation Inequality ( GCI ) , a conjecture that originated in the 1950s , which he had published three years earlier without much recognition .