Parity of permutations, impossible puzzles and the magical determinant

Description

This is a video I've been meaning to do for a long, long time. I've used the parity of permutations in quite a few videos and I've repeatedly promised to give a proper explanation in a separate video. This is it! Parity of permutations, the distinction between even and odd permutations or rearrangements, is one of the simplest nontrivial invariants in mathematics, yet it has far-reaching consequences across many areas. This seemingly modest idea underpins the structure of the alternating group, a fundamental object in group theory that plays a key role in understanding symmetry. In linear a