english: But if it wasn't for Mr. Euler -- who wrote almost 70 volumes of mathematics and had 13 children, who he apparently would dandle on his knee while he was writing -- if it wasn't for Mr. Euler, there wouldn't perhaps be these invariants.
non_english: Ama eğer, yaklaşık 70 cilt matematik kitabı yazan, 13 çocuğu olup yazarken dizinde çocuklarını sallayan Bay Euler olmasaydı -- muhtemelen bu değişkenler de olmayacaktı.