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I remember that Soviet-era math books were really good. At least the ones you could get in Spain (translated of course). Probable not the reason, but a factor

• vram22 8y ago
  >I remember that Soviet-era math books were really good. Right. I remember reading some as a school/college student. Ya. Perelman (author) was a good one, of some math and physics ones. I remember good discussions of perpetual machines and other popular science topics, well explained. I think their government subsidized the books for sale in countries as a form of propaganda. Still, they were good.