What are the two definitions of gamma function and how are they related?

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SUMMARY

The discussion centers on the two definitions of the gamma function: one expressed as an integral and the other as an infinite product. The integral definition is commonly used, while the infinite product form is crucial for proving various properties, including the gamma reflection formula. The participant seeks assistance in establishing the equivalence of these two definitions, highlighting the significance of the infinite product in advanced mathematical proofs.

PREREQUISITES
  • Understanding of special functions in mathematics
  • Familiarity with integral calculus
  • Knowledge of infinite series and products
  • Basic concepts of mathematical proofs
NEXT STEPS
  • Study the properties of the gamma function, focusing on the gamma reflection formula
  • Explore the Bohr–Mollerup theorem and its implications for the gamma function
  • Learn about the relationship between integral and product representations of functions
  • Investigate advanced topics in special functions, including their applications in complex analysis
USEFUL FOR

Mathematicians, students of advanced calculus, and anyone interested in the properties and applications of special functions, particularly the gamma function.

LHS1
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I spend some time studying special functions recently. I found two definitions of gamma function, one in form of integral and the other in form of infinite products, and I cannot prove of their equivalence. I found the definition in infinite product form important in proofing many properties of gamma function such as gamma reflection formula, therefore I eager to learn it. Could anyone help me, please !
 
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