# More of a Conceptual Question

Why conceptually, does the ground state for the particle in the box model correspond to n=1 while for the harmonic oscillator and the particle on a ring model it is n=0? For all three models, why don't we consider negative quantum numbers?

attempt:...the particle in a box and particle on ring use the quantum number n in the equation to solve the time independent diff-eq. and n=1 and n=1 correspond to ground state levels...