If A and B are two Hermitian operators, showthat AB and BA may

not be Hermitian, but that (AB + BA) andi(AB-BA) are both

hermitian. Prove that the expectation value ofA2 is

always real and non-negative. If A2=2,find the

eigenvalues of A.

i would think it's food chain

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force