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- Identity theorem (complex analysis)
- Identity theorem for Riemann surfaces (Riemann surfaces)
- Immerman–Szelepcsényi theorem (Computational complexity theory)
- Implicit function theorem (vector calculus)
- Increment theorem (mathematical analysis)
- Infinite monkey theorem (probability)
- Integral root theorem (algebra, polynomials)
- Initial value theorem (integral transform)
- Integral representation theorem for classical Wiener space (measure theory)
- Intermediate value theorem (calculus)
- Intercept theorem (Euclidean geometry)
- Intersection theorem (projective geometry)
- Inverse eigenvalues theorem (Linear algebra)
- Inverse function theorem (vector calculus)
- Isomorphism extension theorem (abstract algebra)
- Isomorphism theorem (abstract algebra)
- Isoperimetric theorem (curves, calculus of variations)
Read more about this topic: List Of Theorems