Which mathematical concept was central to the successful 2009 marketing campaign that rebranded and popularized a mathematical education software company, resulting in a 400% increase in sales?

Mathematics and marketing might seem like distant cousins, but they've had some remarkable intersections throughout history. From statistical models that revolutionized consumer targeting to mathematical concepts that became brand identities, the relationship has been powerful. This trivia question focuses on a famous marketing strategy that leveraged mathematical concepts to create a distinctive brand identity. Test your knowledge of where abstract mathematics met mainstream marketing!

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The Golden Ratio (φ), marketed as 'The Divine Proportion' for perfect learning curves
Euler's Identity (e^(iπ)+1=0), promoted as 'The Most Beautiful Formula' for beautiful understanding
Fibonacci Sequence, advertised as 'Nature's Code' for natural learning progression
Mandelbrot Set, branded as 'Infinite Complexity from Simple Rules' for learning efficiency