Crossword Genius

Eponymous physicist Mach (5)

Ross

I believe the answer is:

ernst

(Other definitions for ernst that I've seen before include "Max __; Dadaist" , "He painted" , "Young partner" , "Max -, twentieth century German Surrealist artist" , "Surrealist; stern (anag.)" .)

I've seen this clue in The Wall Street Journal and The New York Times.
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