Conservative mathematicians labeled such objects mathematical monsters or anomalies when these first surfaced in the late 19th century in the works of Weierstrass, Cantor, Koch and Peano.

• 19世纪末，当这些东西首次出现在魏尔斯特拉斯、康托、科赫和皮亚诺著作中的时候，保守的数学家们给它们贴上了数学怪物或数学异常的标签。