so we know that the divergence theorm, was proved by Gauss, and also proved by ostrogradsky. but infact, the divergence theorm was discovred by Lagrange...correct? now, did these 3 guys prove it differently? I'm sure it couldn't be exactly the same way right? basically, I've been searching the internet all over, and can't find the differen't variations of the proof for the divergence theorem... any help?