▁History ▁of ▁Nin ete enth ▁Century ▁Mathemat ics , ▁B irk hä user ▁▁▁ 1 9 8 4 : ▁" The ▁closure ▁theorem ▁of ▁P once let ", ▁R end . ▁Sem . ▁Mat . ▁F is . ▁Milano ▁ 5 4 , ▁ 1 4 5 – 1 5 8 ▁( 1 9 8 7 ). ▁▁ 1 9 8 7 : ▁( with ▁K ers , ▁C .; ▁O ort , ▁F .; ▁R aven , ▁D . ▁W .) ▁" P once let ' s ▁closure ▁theorem ", ▁Ex position . ▁Math . ▁ 5 ▁no . ▁ 4 , ▁ 2 8 9 – 3 6 4 . ▁Joseph ▁Harris ▁wrote ▁for ▁Mathemat ical ▁Re views , ▁" The ▁authors ▁trace ▁very ▁carefully ▁the ▁history ▁of ▁the ▁problem , ▁describing ▁various ▁approaches ▁cul min ating ▁in ▁a ▁modern ▁proof . ▁The ▁paper ▁is ▁fasc in ating ▁from ▁both ▁a ▁historical ▁and ▁a ▁mathematical ▁point ▁of ▁view , ▁and ▁should ▁serve ▁as ▁the ▁definit ive ▁source ▁of ▁information ▁about ▁P once let ' s ▁problem ▁in ▁the ▁future " ▁ ▁here ▁▁ 1 9 9 3 : ▁L ect ures ▁in ▁the ▁History ▁of ▁Mathemat ics , ▁History ▁of ▁Mathemat ics ▁# 7 , ▁American ▁Mathemat ical ▁Society ▁& ▁London ▁Mathemat ical ▁Society ▁▁ 2 0 0 1 : ▁Red ef ining ▁Ge omet rical ▁Ex act ness . ▁Des cart es ' ▁transformation ▁of ▁the ▁early ▁modern ▁concept ▁of ▁construction , ▁S ources ▁and ▁Studies ▁in ▁the ▁History ▁of