- classical probability
- classical probability model
- classical probability theory
- classical problem
- classical propositional calculus
- classical propositional logic
- classical pseudodifferential operator
- 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