Crossword Genius

Mathematician's logarithmic base rule broken (5)

Ross

I believe the answer is:

euler

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

'mathematician's' is the definition.
(I've seen this before)

'logarithmic base rule broken' is the wordplay.
'logarithmic base' becomes 'e' (Euler's number - base of natural logarithms. I am not sure about the 'logarithmic' bit.).
'broken' indicates an anagram.
'rule' anagrammed gives 'uler'.
'e'+'uler'='EULER'

Can you help me to learn more?

(Other definitions for euler that I've seen before include "18th-century Swiss mathematician and physicist" , "Leonhard -, C-eighteen Swiss mathematician" , "Leonhard -----, founder of mathematical analysis" , "Eighteen-hole game" , "Leonhard -, Eighteenth century Swiss mathematician" .)

I've seen this clue in The Independent.
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