3 ms·Clearly useful for typesetting reflections of mathematical proofs. /sby progbits 5y agoClearly useful for typesetting reflections of mathematical proofs. /swillis936 5y agoIt's how Leonardo Da Vinci would type up proofs.mkl 5y agoI think he would have typed things left to right. He only wrote in mirror because it was more ergonomic for him, but there's no such issue with a keyboard.