Which major publishing merger created the largest mathematics textbook and digital content provider in 2006, controlling approximately 40% of the global higher education mathematics market?

The academic mathematics publishing landscape has undergone significant consolidation in recent decades. Major publishing houses have strategically acquired smaller publishers to dominate the market for textbooks, journals, and digital learning platforms. This poll tests your knowledge about one of the most significant brand mergers in the mathematics publishing industry that transformed how mathematical content is distributed to educational institutions worldwide.

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Cengage Learning's acquisition of McGraw-Hill's mathematics division
Pearson's merger with Houghton Mifflin's advanced mathematics department
The merger between Springer and Kluwer Academic Publishers
Wiley's acquisition of Cambridge University Press's mathematics portfolio