，双角锥同构，同纬同构- matching theory
- match problem
- matchstick construction
- matchstick graph
- mate
- material
- material derivative
- material derivative method
- material equivalence
- material implication
- material operator
- material point
- material relation
- mathematical abstraction
- mathematical analysis
- mathematical apparatus
- mathematical argument
- mathematical axiom
- mathematical biology
- mathematical cartography
- mathematical characterization
- mathematical concept
- mathematical constant
- mathematical crystallography
- mathematical definition