Which e-commerce platform was specifically created by mathematicians and initially focused exclusively on selling advanced mathematical software before expanding to other educational products?

The world of mathematics education has been transformed by specialized e-commerce platforms that cater to students, teachers, and math enthusiasts. These platforms offer everything from interactive learning tools to advanced graphing calculators and mathematical software. Test your knowledge about the intersection of mathematics education and e-commerce innovation!

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Mathemarket (founded 1998 by a team from the Institute of Advanced Mathematical Research)
NumberNexus (launched 2003 as a Stanford University spin-off project)
AlgebraAlley (established 2001 by former Texas Instruments developers)
CalculusCorner (created in 2005 by mathematics professors from MIT)