Which retail innovation did Springer Mathematics implement in 2015 that transformed how customers access mathematical research papers and textbooks?

The digital transformation has dramatically changed how mathematical content is published, distributed, and accessed. Major mathematical publishing houses have had to adapt their retail strategies and customer engagement approaches to remain relevant in an era where open-access journals and digital platforms are gaining popularity. Test your knowledge about this evolution in mathematical content distribution!

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MathJax interactive equation system allowing readers to manipulate equations in real-time
Springer Nature SharedIt link-sharing initiative, allowing authors to share view-only versions of papers with non-subscribers
Mathematical Content Store, a pay-per-theorem system where readers only purchase specific proofs they need
Springer Mathematics Club, a subscription service offering physical copies of all new mathematical publications monthly