Writing-book with mathematical lectures against a background a lot of books

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Size: 4200px × 3900px
Photo credit: © Rachko / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: 1960s, book, bookcase, books, bookshelf, data, education, erudition, exact, examination, formula, handwriting, heap, information, knowledge, lecture, mathematical, mathematics, notebook, page, paper, penholder, pile, problem, proof, retro, school, science, scientific, sign, solution, student, study, task, university, vintage, writing