295936
The modern symbol for inclusion first appears in Gergonne ( 1816 ) , who defines it as one idea ' containing ' or being ' contained ' by another , using the backward letter ' C ' to express this .
 Gergonne
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gergonne