，平均（值）；中项- classical quantificational logic
- classical real cohomology
- classical real simple Lie algebras
- classical ring
- classical risk theory
- classical ruin problem
- classical Runge-Kutta method
- classical semi simple ring
- classical series
- classical set theory
- classical solution
- classical space
- classical special function
- classical stability
- classical statistical theory
- classical statistics
- classical Stefan problem
- classical structure
- classical subalgebra
- classical surface
- classical symbol
- classical theorem
- upper class limit
- upper closure
- upper cone