English: u₁(x,t) − u₂(x,t) = 0 that implies u₁(x,t) = u₂(x,t), ∀x, t so what does it mean?
Telugu: u₁(x,t) − u₂(x,t) = 0 అంటే u₁(x,t) = u₂(x,t), ∀x, t అంటే ఏమిటి?