Crossword Genius

Solution of triangle not involving fractions (8)

Ross

I believe the answer is:

integral

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'solution' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'triangle not involving fractions' is the wordplay.
'triangle' can be anagrammed to 'INTEGRAL'.
Though, I'm unsure how this is indicated.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for integral that I've seen before include "Fundamental; function" , "United" , "Mathematical quantity" , "Unimpaired" , "Formed of constituent parts" .)

I've seen this clue in The Everyman puzzle in The Observer.
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