Hadamard (disambiguation)

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Hadamard may refer to:

  • Jacques Hadamard (1865–1963), a French mathematician, whose name is associated with the following topics in mathematics:
Differential geometry 
Differential equations and dynamical systems 
Complex analysis and convexity 
Transform calculus 
Theory of matrices 
  • Hadamard matrix, a square matrix whose entries are either +1 or −1 and whose rows are mutually orthogonal
  • Hadamard code, a system used for signal error detection and correction based on Hadamard matrices
  • Hadamard's inequality, a bound on the determinants of matrices.