Smelly Socks
public text v1 · immutable(A sub 1 P sub 1 X sub 1 + A sub 2 P sub 2 X sub 2 + ... + A sub N P sub N X sub N) over (A sub 1 P sub 1 + A sub 2 P sub 2 + ... + A sub N P sub N)
(A sub 1 P sub 1 Y sub 1 + A sub 2 P sub 2 Y sub 2 + ... + A sub N P sub N Y sub N) over (A sub 1 P sub 1 + A sub 2 P sub 2 + ... + A sub N P sub N)