Mathematician's logarithmic base rule broken (5)
I believe the answer is:
euler
'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" .)