Claim: Arthur Schopenhauer was only ever a mathematician.
Evidence: Arthur Schopenhauer -LRB- -LSB- ˈaɐ̯tʊɐ̯ ˈʃoːpm̩ˌhaʊ̯ɐ -RSB- ; 22 February 1788 -- 21 September 1860 -RRB- was a German philosopher.