65306
In 1932 he introduced the general concept of inversion of functional correspondence , showing that a transformation between two Banach spaces is invertible only if it is locally invertible and if the only convergent sequences are the compact ones .
 Banach
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Banach