Nuprl Lemma : add_com
12,41
postcript
pdf
a
,
b
:
.
a
+
b
=
b
+
a
latex
ProofTree
Definitions
t
T
,
x
:
A
.
B
(
x
)
origin
a, b:
. a+b = b+a
a, b:. a+b = b+a
Tx:A. B(x)