context: In 1794, Lagrange was appointed professor of the École Polytechnique; and his lectures there, described by mathematicians who had the good fortune to be able to attend them, were almost perfect both in form and matter.[citation needed] Beginning with the merest elements, he led his hearers on until, almost unknown to themselves, they were themselves extending the bounds of the subject: above all he impressed on his pupils the advantage of always using general methods expressed in a symmetrical notation.
source: But Lagrange does not seem to have been a successful teacher.
reference_original: Ma Lagrange non sembra essere stato un professore di successo.
reference_flipped: Ma Lagrange non sembra essere stata una professoressa di successo.