N and M fingers?
heh, mine are labeled "A", "B", and "C", etc.
But seriously, the disclosure uses "N" to represent some number of finger(tips), say 2, or 3, or 4. "M" is a number different from whatever "N" is. The part of the disclosure that is reproduced above has one action, which reads like scrolling the entire screen, on a gesture with "N" fingertips (say 2), but the same gesture with a different number of fingertips causes only part of the display to scroll.
-PJ