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 20th March 2006.

• mathematical equations 1 and 6 of 8,590,000
• mathematical books 9 of 13,200,000
• algebraic equations 2 and 20 of 3,120,000
• mathematical physics equations 1 and 2 of 3,180,000
• exact solutions 10 and 18 of 21,200,000
• equations exact solutions 1 and 2 of 1,280,000
• differential equations 89 of 8,160,000
• differential equations exact solutions 1 and 13 of 514,000
• differential equations books 11 and 12 of 1,360,000
• differential equations systems 40 of 4,240,000
• differential equations software 21 of 1,930,000
• ordinary differential equations 7 of 1,600,000
• partial differential equations 18 of 2,740,000
• partial differential equations linear 2 and 3 of 1,490,000
• partial differential equations nonlinear 2 and 4 of 994,000
• hyperbolic equations 2 and 3 of 906,000
• elliptic equations 3 and 4 of 1,030,000
• parabolic equations 2 and 7 of 716,000
• integral equations 2 and 5 of 3,300,000
• integral equations linear 4 and 10 of 1,730,000
• integral equations nonlinear 1 and 16 of 808,000
• integral equations books 2 and 8 of 579,000
• functional equations 2 and 3 of 3,030,000
• functional equations books 3 and 6 of 597,000
• functional differential equations 12 of 1,260,000
• difference equations 25 of 5,360,000
• integrals 20 of 3,000,000
• integral transforms 9 of 1,020,000
• special functions 7 of 71,600,000
• mathematical physics 68 of 12,400,000
• heat equation 25 and 30 of 4,620,000
• diffusion equation 19 of 2,300,000
• wave equation 59 of 5,010,000
• Laplace equation 18 of 813,000
• boundary layer equations 6 and 10 of 887,000
• Klein-Gordon equation 3 and 4 of 171,000
• Korteweg-de Vries equation 2 and 6 of 70,300
• Navier-Stokes equations 38 of 782,000
• Schrodinger equation 14 and 16 of 382,000
• Bessel equation 9 and 11 of 312,000
• Abel equation 7 and 8 of 227,000
• Mathieu equation 3 and 5 of 133,000
• Riccati equation 1 and 28 of 119,000
• Legendre equation 5 and 10 of 243,000
• Volterra integral equations 3 and 12 of 90,500
• Fredholm integral equations 2 and 7 of 81,600
• Cauchy equation 4 and 5 of 460,000
• Monge-Ampere equation 4 and 5 of 4,820
• Ermakov equation 2 and 5 of 845
• Emden-Fowler equation 3 and 4 of 756
• mathematical software 56 of 15,500,000
• method separation of variables 42 of 1,360,000