Practice problem
Let XXX be a scheme. Then XXX is necessarily a scheme over which of the following base schemes SSS?
SpecOX(X)\operatorname{Spec} \mathcal{O}_X(X)SpecOX(X)
SpecZ\operatorname{Spec} \mathbb{Z}SpecZ
SpecQ\operatorname{Spec} \mathbb{Q}SpecQ
SpecFp\operatorname{Spec} \mathbb{F}_pSpecFp
Type a concept, like “slope” or “photosynthesis”.