Mathematical Software. Mathematical Research. Mathematical Education. Tvalx Products.
Somewere in 2008-2012 I had programed Derivative Calculator Level 1 and Derivative Calculator Level 2. There were no other high orders derivative calculator around, at least visible in internet. Then tvalx.com colapsed due to software and financial monopolies. Now, in 2025, when I decided to resurrect tvalx.com under name tvalx.org, I found out, for my surprise, that nothing has changed. Derivative Calculator Level 1 continues to have no competitors for title the first in the world high oders derivative calculator.
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