Mathematical folklore, theorems that are widely known to mathematicians but cannot be traced back to an individual
folk music | folk | Folk music | folk rock | Queer as Folk | folk art | Folk | American folk music | American Folk Art Museum | Liouville's theorem | Anthology of American Folk Music | Queer as Folk (North American TV series) | Newport Folk Festival | Roud Folk Song Index | American folk music revival | Modern Folk Quartet | Chinese remainder theorem | Woodford Folk Festival | Mexican handcrafts and folk art | Gerde's Folk City | Folk music of Ireland | folk high school | The Souls of Black Folk | Shannon–Hartley theorem | Quillen–Suslin theorem | Poor Folk | Philadelphia Folk Festival | Nyquist–Shannon sampling theorem | Mariposa Folk Festival | Hahn–Banach theorem |