34 lines
555 B
Text
34 lines
555 B
Text
exit
|
|
open nat
|
|
|
|
example (a b c : nat) : a = 0 → b = 1 + a → a = b → false :=
|
|
begin
|
|
intro a0 b1 ab,
|
|
subst a0 b1,
|
|
state,
|
|
contradiction
|
|
end
|
|
|
|
example (a b c : nat) : a = 0 → b = 1 + a → a = b → false :=
|
|
begin
|
|
intro a0 b1 ab,
|
|
subst a0, subst b1,
|
|
state,
|
|
contradiction
|
|
end
|
|
|
|
example (a b c : nat) : a = 0 → 1 + a = b → a = b → false :=
|
|
begin
|
|
intro a0 b1 ab,
|
|
subst a0 b1,
|
|
state,
|
|
contradiction
|
|
end
|
|
|
|
example (a b c : nat) : a = 0 → 1 + a = b → a = b → false :=
|
|
begin
|
|
intros,
|
|
subst a b,
|
|
state,
|
|
contradiction
|
|
end
|