Math Glossary, Math Terms, I
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- Ian McGee's Observation
- Ideal elements
- Ideal subrings
- Idempotent law
- Identical Twins Puzzle
- Identical Transformation
- Identity
- Identity matrix
- iff
- Illusory contour
- Imaginary numbers
- Imaginary Part of a Complex Number
- Impartial game
- Implication
- Implicit Equation of a Straight Line
- Impossible Fork
- Impossible page
- Improper Isometry
- Incidence matrix
- Incident points and lines
- Incenter
- Incenters in Cyclic Quadrilateral
- Incircle
- Inclusion-Exclusion Principle
- Incompatible Events
- Indegree
- Independent Events
- Index
- Index Lemma, the
- Indirect Proof
- Induction
- Infinite Discent for x4 + y4 = z4
- Infinite Products
- Infinite Descent?
- Infinite Sums
- Infinitesimal
- Infinitude of Primes
- Infinity
- Inflectin point
- Injective function
- Inner product
- Inner Soddy circle
- Inradius
- Inscribed Angles
- Inscribed Angle Theorem
- Inscriptable (inscriptible) Polygons
- Integer
- Integer Iterations on a Circle
- Integral Domain
- Integration in Spherical Coordinates
- Intercept
- Intercepted Arc
- Interest Calculations
- Interior Angles formed by a secant and parallel lines
- Intermediate Value Theorem
- Internal point
- Internal Tangent to Two Circles
- Internet News sites
- Intersecting Chords (Secants) Theorem
- Intersection of sets
- Intouch Triangle
- Invariant Set
- Inventor's Paradox
- Inverse Element
- Inversion (combinatorial)
- Inversion (geometric)
- Invert the Divisor and Multiply
- Involution
- Irrational numbers
- ISBN Encoding
- Isogonal lines
- Isogonal points
- Isogonic Centers
- Isolated point
- Isometry
- Isosceles trapezoid
- Isosceles Tetrahedron
- Isosceles triangle
- Isotomic lines
- Isotomic conjugates
- Isoperimetric Inequality
- Isoperimetric Theorem
- Isoperimetric Theorem, a variation on
- Isoperimetric Theorem, a different one
- Iterative process

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