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18 alias symbol "eq" (instance 0) = "Coq's leibnitz's equality".
19 alias id "plus" = "cic:/Coq/Init/Peano/plus.con".
20 alias id "S" = "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1/2)".
21 alias id "O" = "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1/1)".
22 alias id "not" = "cic:/Coq/Init/Logic/not.con".
23 alias id "nat" = "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1)".
24 alias id "plus_comm" = "cic:/Coq/Arith/Plus/plus_comm.con".
26 theorem t: let f \def \lambda x,y. x y in f (\lambda x.S x) O = S O.
27 intros. simplify. change in \vdash (? ? (? ? %) ?) with O.
30 theorem X: \forall x:nat. let myplus \def plus x in myplus (S O) = S x.
31 intros. simplify. change in \vdash (? ? (% ?) ?) with (plus x).
33 rewrite > plus_comm. reflexivity. qed.
35 theorem R: \forall x:nat. let uno \def x + O in S O + uno = 1 + x.
37 change in \vdash (? ? (? %) ?) with (x + O).
38 rewrite > plus_comm. reflexivity. qed.