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| # | Thing | Description | Topic | For | Against | Net | |
|---|---|---|---|---|---|---|---|
| 201 |  | Number theory | Branch of pure mathematics | Mathematics | 0 | 0 | 0 |
| 202 |  | Numeral system | Notation for expressing numbers | Mathematics | 0 | 0 | 0 |
| 203 |  | Numerical analysis | Methods for numerical approximations | Mathematics | 0 | 0 | 0 |
| 204 | Numerical digit | Symbols used to write numbers | Mathematics | 0 | 0 | 0 | |
| 205 |  | Numerical integration | Methods of calculating definite integrals | Mathematics | 0 | 0 | 0 |
| 206 | Observational study | Study with uncontrolled variable of interest | Mathematics | 0 | 0 | 0 | |
| 207 |  | Open set | Basic subset of a topological space | Mathematics | 0 | 0 | 0 |
| 208 | Operations research | Discipline concerning the application of advanced analytical methods | Mathematics | 0 | 0 | 0 | |
| 209 | Order of operations | Performing order of mathematical operations | Mathematics | 0 | 0 | 0 | |
| 210 |  | Ordinary differential equation | Differential equation containing derivatives with respect to only one variable | Mathematics | 0 | 0 | 0 |
| 211 |  | Ordinary least squares | Method for estimating the unknown parameters in a linear regression model | Mathematics | 0 | 0 | 0 |
| 212 | P versus NP problem | Unsolved problem in computer science | Mathematics | 0 | 0 | 0 | |
| 213 | P-value | Function of the observed sample results | Mathematics | 0 | 0 | 0 | |
| 214 |  | Parabola | Plane curve: conic section | Mathematics | 0 | 0 | 0 |
| 215 |  | Parametric equation | Representation of a curve by a function of a parameter | Mathematics | 0 | 0 | 0 |
| 216 |  | Parity (mathematics) | Property of being an even or odd number | Mathematics | 0 | 0 | 0 |
| 217 | Partial derivative | Derivative of a function with multiple variables | Mathematics | 0 | 0 | 0 | |
| 218 |  | Partial differential equation | Type of differential equation | Mathematics | 0 | 0 | 0 |
| 219 |  | Percentage | Number or ratio expressed as a fraction of 100 | Mathematics | 0 | 0 | 0 |
| 220 |  | Permutation | Mathematical version of an order change | Mathematics | 0 | 0 | 0 |
| 221 | Pi | Number, approximately 3.14 | Mathematics | 0 | 0 | 0 | |
| 222 | Plane (mathematics) | 2D surface which extends indefinitely | Mathematics | 0 | 0 | 0 | |
| 223 | Poincaré conjecture | Theorem in geometric topology | Mathematics | 0 | 0 | 0 | |
| 224 |  | Point (geometry) | Fundamental object of geometry | Mathematics | 0 | 0 | 0 |
| 225 |  | Poisson distribution | Discrete probability distribution | Mathematics | 0 | 0 | 0 |
| 226 |  | Polar coordinate system | Coordinates comprising a distance and an angle | Mathematics | 0 | 0 | 0 |
| 227 | Polygon | Plane figure bounded by line segments | Mathematics | 0 | 0 | 0 | |
| 228 |  | Polyhedron | Flat-sided three-dimensional shape | Mathematics | 0 | 0 | 0 |
| 229 | Polynomial | Type of mathematical expression | Mathematics | 0 | 0 | 0 | |
| 230 |  | Positional notation | Method for representing or encoding numbers | Mathematics | 0 | 0 | 0 |
| 231 |  | Prime number | Number divisible only by 1 and itself | Mathematics | 0 | 0 | 0 |
| 232 | Prime number theorem | Characterization of how many integers are prime | Mathematics | 0 | 0 | 0 | |
| 233 |  | Probability | Number measuring the chance an event occurs | Mathematics | 0 | 0 | 0 |
| 234 |  | Probability density function | Description of continuous random distribution | Mathematics | 0 | 0 | 0 |
| 235 | | Probability distribution | Mathematical function for the probability a given outcome occurs in an experiment | Mathematics | 0 | 0 | 0 |
| 236 | | Probability theory | Branch of mathematics concerning probability | Mathematics | 0 | 0 | 0 |
| 237 | Propositional logic | Branch of logic | Mathematics | 0 | 0 | 0 | |
| 238 |  | Pure mathematics | Mathematics independent of applications | Mathematics | 0 | 0 | 0 |
| 239 |  | Pythagorean theorem | Relation between sides of a right triangle | Mathematics | 0 | 0 | 0 |
| 240 | Quadratic equation | Polynomial equation of degree two | Mathematics | 0 | 0 | 0 | |
| 241 |  | Quadrilateral | Four-sided polygon | Mathematics | 0 | 0 | 0 |
| 242 | | Random variable | Variable representing a random phenomenon | Mathematics | 0 | 0 | 0 |
| 243 |  | Randomized controlled trial | Form of scientific experiment | Mathematics | 0 | 0 | 0 |
| 244 |  | Rational number | Quotient of two integers | Mathematics | 0 | 0 | 0 |
| 245 | Real analysis | Mathematics of real numbers and real functions | Mathematics | 0 | 0 | 0 | |
| 246 |  | Real number | Number representing a continuous quantity | Mathematics | 0 | 0 | 0 |
| 247 |  | Regression analysis | Set of statistical processes for estimating the relationships among variables | Mathematics | 0 | 0 | 0 |
| 248 |  | Representation theory | Branch of mathematics that studies abstract algebraic structures | Mathematics | 0 | 0 | 0 |
| 249 |  | Riemann hypothesis | Conjecture on zeros of the zeta function | Mathematics | 0 | 0 | 0 |
| 250 |  | Riemann surface | One-dimensional complex manifold | Mathematics | 0 | 0 | 0 |
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