Task: Text Categorization
Input (English): man warned readers to avoid "persecution mania" and the Byronic form of the title concept in the section "The Causes of Unhappiness. " He attacked the equivocation inherent in the term "knowledge" and suggested a division based on level of direct familiarity into "knowledge by description" and "knowledge by acquaintance. " Richard Dawkins popularized this thinker's analogy of an invisible teapot revolving around the sun. This philosopher advanced his distinction between definite and indefinite descriptions in his essay (*) "On Denoting. " He used a parable about a barber to explain a namesake paradox, which considers the set of all sets that are not members of themselves. For 10 points, name this British philosopher who collaborated with Alfred North Whitehead on Principia Mathematica.
Output (English): Social Science