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The following are named after Henri Lebesgue:

• Blaschke–Lebesgue theorem
• Cantor–Lebesgue function
• Borel–Lebesgue theorem
• Fatou–Lebesgue theorem
• Lebesgue constant
• Lebesgue covering dimension
• Lebesgue differentiation theorem
• Lebesgue integration
• Lebesgue measure
  • Infinite-dimensional Lebesgue measure
• Lebesgue point
• Lebesgue space
• Lebesgue–Rokhlin probability space
• Lebesgue–Stieltjes integration
• Lebesgue–Vitali theorem
• Lebesgue spine
• Lebesgue's lemma
• Lebesgue's decomposition theorem
• Lebesgue's density theorem
• Lebesgue's dominated convergence theorem
• Lebesgue's number lemma
• Lebesgue's universal covering problem
• Riemann–Lebesgue lemma
• Walsh–Lebesgue theorem