Category talk:20th-century mathematicians

Subcategories
Are subcategories of the following form needed: for example an example for needing this is Giuseppe Peano, who at the moment is in categories Category:Italian mathematicians and Category:20th-century mathematiciansBrad7777 (talk) 15:16, 5 November 2011 (UTC)
 * "20th-century Italian mathematicians"
 * "20th-century German mathematicians"