Some of you may be aware of Vladimir Bondarenko, who is an 'interesting' 
character who can be very childish at times, but has written some 
interesting software which can find faults with computer algebra systems.

He took a quick look at http://demo.sagenb.org/ as he could potentially 
hook up his software to test Sage online. (He is looking for commercial 
backers, so might not be easy to get help).

Anyway, has he found a bug, or just mis-use.



--------- from  Vladimir Bondarenko ----------------------
By the way, you referred to this link about running the Sage online

http://demo.sagenb.org/

I tried it for fun (without reading the help) and found that

exp(-x).integral(x,0,infinity) returns 1 which is OK

(sin(x)/x).integral(x,0,infinity)  returns 1/2*pi which is OK

i^2 returns -1 so  i  stands for sqrt(-1)

but

exp(-x^i).integral(x,0,1)  returns

Traceback (click to the left for traceback)
...
Is %i an integer?

Ouch! Any Sage comments?



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