ZLi

### Environment Details Please indicate the following details about the environment in which you found the bug: *Copulas version: 0.5.1 *Python version: 3.6.3 *Operating System: CentOS Linux release 7.9.2009 ###...

### Environment Details * Copulas version: 0.5.1 * Python version: 3.6.3 * Operating System: CentOS Linux release 7.9.2009 ### Error Description When theta is 1, Gumbel copula should be reduced...