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.
Но если бы не господин Эйлер, написавший почти 70 томов, посвящённых математике, имевший 13 детей, которых он, очевидно, качал на коленках, пока писал работу, — если бы не Эйлер, то, возможно, и не было бы никаких инвариантов.