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Mathematicians such as Karl Weierstrass ( 1815 – 1897 ) discovered pathological functions such as continuous , nowhere-differentiable functions .
 person: Karl Weierstrass
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Karl Weierstrass