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===17th century=== | ===17th century=== | ||
There are three kinds of systems: | |||
1) Two eleven-limit diamonds spaced a perfect fifth apart, or two (1...13)x(1...1/7) diamonds spaced a perfect fifth apart | |||
2) A cross set (1...15)x(1...15) | |||
3) An Euler-Fokker genus 3⁴x5²x7² | |||
===19th century (popular)=== | ===19th century (popular)=== |
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