• #### why wolfram cannot find SIMPLE solution of over 50 differential equatio

From drhuang57@gmail.com@21:1/5 to All on Thu Jan 14 00:24:29 2021
Wolfram cannot find SIMPLE solution or cannot solve fractional differential equations and following differential equations, which mathHand.com can :

y"-x*y'-x*y-x=0
y"-x*y'-x*y-2x=0
y"-x*y'-x*y-3x=0
y"-x*y'-x*y-n*x=0 where n=1,2,3 ......
y"-x*y'-x*y-x^2-x=0
y"-x*y'-x*y-x^3+2=0
y"-x*y'-x*y-x^4-6=0
y"-x*y'-x*y-x^5+24=0
y"-x*y'-x*y-x^n=0, where n=1,2,3 ......
y"-a*x*y'-b*x*y-c*x^n=0, where n=1,2,3 ......
y"-y'-x*y-x=0
y"-y'-x*y-x^2=0
y"-y'-x*y-x^2-1=0
y"-2*y'-x*y-x^2-2=0
y"-4*y'-x*y-x^2-4=0
y"-y'-x*y-x^3-x^2+1=0
y"-2y'-x*y-x^3-x^2=0
y"-y'-x*y-x^3+2=0
y"-2y'-x*y-x^3+2=0
y"-4y'-x*y-x^3+2=0
y"-6y'-x*y-x^3+2=0
y"-8y'-x*y-x^3+2=0
y"-y'-x*y-x^4+3=0
y"-y'-x*y-x^n=0, where n=1,2,3......
y"-a*y'-b*x*y-c*x^n=0, where n=1,2,3 ......
y"-x*y-x^3+2=0
y"-x*y-x^6+40=0
y"-x*y-x^n=0, where n=1,2,3 ......
y"-x*y-x^6-x^3+42=0
y"-x^2*y-x^2=0
y"-x^2*y-x^3=0
y"-x^2*y-x^4=0
y"-x^2*y-x^4+2=0
y"-2x^2*y-x^4+1=0
y"-x^3*y-x^3=0
y"-x^3*y-x^4=0
y"-x^n*y-x^n=0, where n=1,2,3 ......
y"-x^2*y'-x^2*y-x^2=0
y"-x^3*y'-x^3*y-x^3=0
y"-x^n*y'-x^n*y-x^n=0, where n=1,2,3, ......
y"-x^2*y'-x*y-x^2=0
y"-x^2*y'-x^2*y-x^3-x^2=0
y"-x^2*y'-x^3*y-x^4-x^2=0
y"-1/x*y'-x*y-x^2-1/x=0
y"-1/x*y'-x^2*y-x^3-1/x=0
y"-1/x*y'-x^3*y-x^4-1/x=0
y"-x^3*y'-x*y-x^3-x^2=0
y"-x^3*y'-x^2*y-x^3=0
y"-x^3*y'-x^3*y-x^4-x^3=0
y'''-x^3*y'-x^2*y-x^3-=0
.......
more and more examples are in http://drhuang.com/science/mathematics/fractional_calculus/fractional_differential_equation.htm

Input your equation into mathHand.com, click the "dsolve" button for solution, then click the "test" button to test its solution.

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