ClosestPair distance

Question

Can anyone please explain what each of these two functions do, and what could be a simplified equivalent function to each of them?

def dist(p1, p2):
    return math.sqrt((p1.x - p2.x) *
                     (p1.x - p2.x) +
                     (p1.y - p2.y) *
                     (p1.y - p2.y))

def bruteForce(P, n):
    min_val = float('inf')
    for i in range(n):
        for j in range(i + 1, n):
            if dist(P[i], P[j]) < min_val:
                min_val = dist(P[i], P[j])
 
    return min_val