radical
This is an ideal of R which contains I. A radical ideal is an ideal which equals its radical. Prime ideals are radical; indeed, 
equals the intersection of all prime ideals containing I. See also nilradical.
- isosceles trapezium
- isosceles triangle
- isotopy
- iterated series
- iteration
- J
- j
- j
- Jacobian
- Jacobian matrix
- Jacobi, Carl Gustav Jacob
- Jacobi's identity
- Jacobi's iterative method
- Jeffreys, Sir Harold
- Jensen's inequality
- jerk
- joint cumulative distribution function
- joint distribution
- joint probability density function
- joint probability mass function
- jolt
- Jordan block
- Jordan curve
- Jordan Curve Theorem
- Jordan-Hölder Theorem