Integrate x(x+1) doesn't work

[Former user]

Integrate(x(x+1),x) freeze the phone, while Integrate(x*(x+1),x). I already setted relaxedSyntax = true:

[Axel Kramer]

x(arg1) is interpreted as function x() with one argument arg1:

See:

>>> FullForm(x(x+1))
"x(Plus(1, x))"

This commit should solve the problem:

https://bitbucket.org/axelclk/symja_android_library/commits/8bc39d3692efe42771bec299046d11ca3b27fdea

[Axel Kramer]

This commit is also necessary:

https://bitbucket.org/axelclk/symja_android_library/commits/6b0b37438f939184bcf7440162ebbc03f1ef721a

[Dev AM]

With the build "symja-lib-2015-04-30.jar" the bug seems still not fixed

[Axel Kramer]

I get:

>>> Integrate(x(x+1),x)
Integrate(x(x+1),x)

>>> Integrate(x*(x+1),x)
1/3*x^3+1/2*x^2

in the online interface:

http://symjaweb.appspot.com/?ci=ta:Input:t:Integrate(x(x%2B1)%2Cx)

so you have to use the '*' operator or x(arg1) is interpreted as function x() with one argument arg1?

[Dev AM]

The simple code: EvalEngine e = new EvalEngine(true); System.out.println(e.evaluate("Integrate(x(x+1),x)"));

Gives me "Integrate(x(x+1),x)" as result...yes. I guess this is not the correct result, is it?

[Axel Kramer]

"Integrate(x(x+1),x)" cannot be further integrated, so it returns he input

See the difference in the full form of the 2 expressions:

>>> FullForm(x(x+1))
"x(Plus(1, x))

>>> FullForm(x*(x+1))
"Times(x, Plus(1, x))"