Yea I think your right about the version before 6. However if I already paid for the program then I should be able to re-format my drive and reinstall it without having to pay for it again. As for information being free I wouldn't mind gaining access to a database, and adding to it on my spare time without getting paid so we can keep it free. Forget windows I have had too many problems with that OS as of late. Plus I have been reading alot of complaints from others online as well, and other people I do know in person. In my opinion alot more people are starting to flock to linux based OS as of late. Especially once DirectX is workable in linux without the use of a virtual drive, or even wine. A lot more users will then head over aka gamers. Even recently the CEO of Red Hat has talked about planning on ways to stop the use of proprietary coding all over from commercial to industry, etc., and trying to get people into using open-source. Of course the average user will have to know more about computers. Plus linux use to be programmer friendly only before the graphical interface allowing the non-programmers to use it without having too many issues. So maybe in the future linux will be fully user friendly like windows without all of the issues MS has built into windows. Like I said it will be "eventually" a downfall for Mathematica. These events that I have mentioned will take time. As for the symbolics Sage will eventually get the coding down to be on the level Mathematica is at with it's symbolics.
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