Crossword Genius

Record mathematical operation (3)

Ross

I believe the answer is:

log

I believe this is a double definition.

'record' is the first definition.
(logging is a kind of recording)

'mathematical operation' is the second definition.
(short for logarithm)

(Other definitions for log that I've seen before include "A ship or plane's diary" , "Piece of wood for the fire" , "Register" , "number in maths class?" , "Record kept" .)

I've seen this clue in The Times.
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