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.
Mais sans M. Euler -- qui a écrit près de 70 volumes de mathématiques et avait 13 enfants, qui apparemment gesticulaient sur ses genoux quand il écrivait -- sans M. Euler, il n'y aurait peut-être pas ces invariants.