 Hecke algebra, [1], [2]
 generators over `\Z`
 Hecke correspondence
 Hecke operator, [1], [2], [3], [4]
 Hecke operators `\sM_2(\Gamma_0(39))`
 Sage
 Hecke operators `\sM_2(\Gamma_0(6))`
 Sage
 Hecke polynomials
 height
 Heilbronn matrices, [1], [2], [3], [4], [5]
 Sage

 Hermite normal form, [1]
 Hermitian symmetric spaces
 higher level dimension
 cusp forms, [1]
 holomorphic
 holomorphic at $\infty$
 holomorphic at the cusp $\alpha$
 Humbert forms
 hypersimplices
