What does G_0 mean when using desolve?

[Albert Chan]

Note that integration also generate constant of integration.

But, if we use integrated result, F(x), to evaluate F(b) - F(a), the constant cancelled.
Thus, HP Prime CAS (and many other CAS) did not return the constant.

XCAS> ∫(x,x)       → x^2/2

Although constant is not reported, keep in mind it is there ...