Mathematics
- Rational number, a number that can be expressed as a ratio of two integers
- Rational function, a mathematical function which can be written as the ratio of two polynomial functions
- Rational consequence relation
- Rational mapping
- Rational quadratic covariance function
- Rational surface
- Rational root theorem
- Rational sequence topology
- Rational trigonometry
- Rational point
- Rational singularity
- Rational variety
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