fact: Definition addℝ_0_l := λ"Cx" λ"ε₁" λ"ε₂" λ"q₁" λ"q₂" λ"X+0" λ"X" "X+0" @ (λ"εx" λ"ε₀" λ"qx" λ"q₀" λ"X+" λ"0+" "0+" @ "Cx" @ "εx" @ "ε₂" @ "qx" @ "q₂" @ "X+" @ "X").
imports: QArith Psatz ClassicalRealizability.Kbase ClassicalRealizability.Rationals ClassicalRealizability.Real_definitions ClassicalRealizability.Real_relations