fact: Definition addℝ_Req_comm := λ"Cx" λ"Cy" λ"ε₁" λ"ε₂" λ"q₁" λ"q₂" λ"X+Y" λ"Y+X" addℝ_Cauchy @ "Cx" @ "Cy" @ "ε₁" @ "ε₂" @ "q₁" @ "q₂" @ "X+Y" @ (addℝ_switch @ "Y+X").
imports: QArith Psatz ClassicalRealizability.Kbase ClassicalRealizability.Rationals ClassicalRealizability.Real_definitions ClassicalRealizability.Real_relations