4 ms·
Found in Rota's lessons, here: http://www.math.tamu.edu/~cyan/Rota/tenlesses.pdf http://www.math.tamu.edu/~cyan/Rota/tenlesses.pdf
by sanj 16y ago
Found in Rota's lessons, here: http://www.math.tamu.edu/~cyan/Rota/tenlesses.pdf http://www.math.tamu.edu/~cyan/Rota/tenlesses.pdf