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https://www.glc.us.es/~jalonso/calculemus/si-a-b-c-d-e-%e2%88%88-%e2%84%9d-tales-que-a-%e2%89%a4-b-b-c-c-%e2%89%a4-d-d-e-entonces-a-e/
Si a, b, c, d, e ∈ ℝ tales que a ≤ b, b < c, c ≤ d, d < e, entonces a < e
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