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Ah! Geometry transformational in maths branch! (4,6)

Ross

I believe the answer is:

game theory

I'm a little stuck... Click here to teach me more about this clue!

'maths branch' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'ah geometry transformational' is the wordplay.
'ah geometry' can be anagrammed to 'GAME THEORY'.
However, I am not clear how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for game theory that I've seen before include "this might help with decision making" , "part of mathematics" .)

I've seen this clue in The Independent.
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