The school of thought in which a movie may approach the level of Braveheart, but may never reach it, only head towards the theoretical infinity where Braveheart resides.

It should be noted that the x-axis on which the Braveheart Asymptote exists does not necessarily refer to a single idea (i.e. quality, awesomeness, number of bagpipes) but rather everything that Braveheart is and all other movies aspire to be.