The website EqWorld has been tested using the powerful search engine Yahoo for the rating of keywords that appear on EqWorld's pages. Listed below are the keywords tested, the respective highest places of EqWorld's pages in Yahoo search results, and the total number of web pages found by Yahoo for the query. The testing was carried out on 21th December 2005.

• mathematical equations 1 and 6 of 7,010,000
• mathematical books 23 of 12,100,000
• algebraic equations 1 and 21 of 2,510,000
• mathematical physics equations 1 and 2 of 2,730,000
• exact solutions 17 and 20 of 19,800,000
• equations exact solutions 1 and 2 of 1,040,000
• differential equations 90 of 6,820,000
• differential equations exact solutions 1 and 2 of 422,000
• differential equations books 8 and 12 of 1,270,000
• differential equations systems 4 of 3,360,000
• differential equations software 23 of 1,660,000
• ordinary differential equations 5 and 30 of 1,280,000
• partial differential equations 25 and 38 of 2,250,000
• partial differential equations linear 2 and 4 of 1,150,000
• partial differential equations nonlinear 4 and 9 of 773,000
• hyperbolic equations 2 and 4 of 710,000
• elliptic equations 4 and 5 of 810,000
• parabolic equations 3 and 19 of 572,000
• integral equations 2 and 4 of 2,600,000
• integral equations linear 6 and 11 of 1,310,000
• integral equations nonlinear 2 and 13 of 638,000
• integral equations books 2 and 11 of 492,000
• functional equations 1 and 3 of 2,430,000
• functional equations books 4 and 7 of 568,000
• functional differential equations 3 and 14 of 1,010,000
• difference equations 15 of 4,510,000
• integrals 19 of 2,440,000
• integral transforms 9 of 814,000
• special functions 8 of 75,700,000
• mathematical physics 71 of 11,000,000
• heat equation 31 and 34 of 3,860,000
• diffusion equation 72 of 2,000,000
• wave equation 99 of 4,380,000
• Laplace equation 15 of 634,000
• boundary layer equations 6 of 713,000
• Klein-Gordon equation 3 and 4 of 162,000
• Korteweg-de Vries equation 2 and 5 of 57,500
• Navier-Stokes equations 43 of 651,000
• Schrodinger equation 15 and 18 of 298,000
• Bessel equation 9 of 243,000
• Abel equation 7 and 8 of 209,000
• Mathieu equation 4 and 6 of 108,000
• Riccati equation 2 and 21 of 94,600
• Legendre equation 6 and 10 of 194,000
• Volterra integral equations 2 and 11 of 72,300
• Fredholm integral equations 1 and 6 of 64,900
• Cauchy equation 4 and 5 of 343,000
• Monge-Ampere equation 5 and 15 of 4,630
• Ermakov equation 1 and 5 of 806
• Emden-Fowler equation 3 and 4 of 673
• mathematical software 60 of 13,600,000
• method separation of variables 37 of 1,130,000