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Re:Tydlig – Calculator Reimagined for iPad and iPhone by fredsted on Sunday December 15, 2013 @04:58AM (#6908909)
Yep, Grapher is a nice app with an interesting history:

http://en.wikipedia.org/wiki/Grapher

Re:Tydlig – Calculator Reimagined for iPad and iPhone by Someone on Sunday December 15, 2013 @08:33AM (#6909320)
Does Grapher share any source with Graphing Calculator?

I guess it might, given that Apple shipped Graphing Calculator with Mac OS before, and given Graphing Calculator's interesting early history (http://www.pacifict.com/Story/)

(I wonder how Apple negotiated that deal originally. I guess some lawyers spent quite some time arguing whose intellectual property it originally was. The programmers weren't paid by Apple, but worked at Infinite Loop)