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object -> actions -> statements -> relationships

Henri Poincaré distinguished between the memory for steps in a chain of reasoning and the appreciation of the links between propositions. The later was regarded as the more important ability for a mathematician.

There are symbol systems for encoding actions performed upon objects and symbol systems for relations between objects.

1 + 1 = 2 | 2 - 1 = 1 | 2 x 2 = 4 | 4/2 = 2
Brain / Experimental psychology / Psychometry
Developmental trajectory
Extraordinary Individuals are Individuals with...

... remarkable counting abilities, such as Shakuntala Devi: she was able to multiply two 13 digit numbers in 28 seconds in 1980

... intuitive understanding, such as Srinivasa Ramanujan: he wrote down nearly 3.900 new results (theorems, identities and equations)

... insight into abstract structures, such as Alexander Grothendiek: he worked on a rebuilding of algebraic geometry

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