The non-commutative Korteweg–de Vries hierarchy and combinatorial Pöppe algebra

Physics & Astronomy

• hierarchies 95%
• algebra 90%
• polynomials 53%
• expansion 30%
• products 23%
• Fredholm equations 19%
• signatures 9%
• operators 8%
• coefficients 6%

Mathematics

• Hierarchy 79%
• Algebra 53%
• Polynomial 25%
• Product rule 16%
• Partial 16%
• Noncommutative Algebra 15%
• Fredholm Equation 14%
• Hankel Operator 14%
• Polynomial Algebra 14%
• Integrable Equation 14%
• Korteweg-de Vries Equation 12%
• Signature 11%
• Real Line 11%
• Integrability 10%
• Linear Combination 10%
• Linear equation 9%
• Coefficient 6%

Engineering & Materials Science

• Algebra 100%
• Polynomials 74%
• Chemical analysis 24%
• Linear equations 20%
• Set theory 12%