COM­PE­TI­TION

Cosmos - - End Point -

QUES­TION

Whose Prin­ci­ple? De­code where t= t

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The French math­e­ma­ti­cian stated this in 1622. Email your an­swer to com­pe­ti­tions@cos­mos­magazine.com with your name and ad­dress by 31 Novem­ber. Five cor­rect en­tries will win a copy of Hub­ble’s Uni­verse, writ­ten and il­lus­trated by Ter­ence Dick­in­son. See re­view page 92.

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