Sentence:  A "tame <WSD>automorphism</WSD>" is a product of elementary <WSD>automorphisms</WSD>, and a non-tame <WSD>automorphism</WSD> is called "wild". The “tame <WSD>automorphism</WSD> problem” asks whether any <WSD>automorphism</WSD> is tame. 
Meaning of the word marked with <WSD> tags:  An isomorphism of a mathematical object or system of objects onto itself.