数据库 数据库理论 释文 null value relational model 空值关系模型
- trivial center
- trivial character
- trivial circuit
- trivial class
- trivial cohomology functor
- trivial crossed homomorphism
- trivial decomposition
- trivial deformation
- trivial dependence relation
- trivial derivation
- trivial-dimensional domain
- trivial disk knot
- trivial divisor
- trivial edgecut
- trivial element
- trivial embedding
- trivial equality
- trivial extension
- trivial extension algebra
- trivial factor
- trivial fiber bundle
- trivial fiber space
- trivial fibration
- trivial field
- trivial file transfer protocol