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Theorem pythagtriplem2 12886
Description: Lemma for pythagtrip 12903. Prove the full version of one direction of the theorem. (Contributed by Scott Fenton, 28-Mar-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)
Assertion
Ref Expression
pythagtriplem2  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( { A ,  B }  =  {
( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) ,  ( k  x.  ( 2  x.  ( m  x.  n
) ) ) }  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  ->  ( ( A ^ 2 )  +  ( B ^ 2 ) )  =  ( C ^ 2 ) ) )
Distinct variable groups:    A, n, m, k    B, n, m, k    C, n, m, k

Proof of Theorem pythagtriplem2
StepHypRef Expression
1 ovex 5899 . . . . . . . 8  |-  ( k  x.  ( ( m ^ 2 )  -  ( n ^ 2 ) ) )  e. 
_V
2 ovex 5899 . . . . . . . 8  |-  ( k  x.  ( 2  x.  ( m  x.  n
) ) )  e. 
_V
3 preq12bg 3807 . . . . . . . 8  |-  ( ( ( A  e.  NN  /\  B  e.  NN )  /\  ( ( k  x.  ( ( m ^ 2 )  -  ( n ^ 2 ) ) )  e. 
_V  /\  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  e.  _V ) )  ->  ( { A ,  B }  =  { ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) ) ,  ( k  x.  ( 2  x.  ( m  x.  n ) ) ) }  <->  ( ( A  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) ) ) ) ) )
41, 2, 3mpanr12 666 . . . . . . 7  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( { A ,  B }  =  {
( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) ,  ( k  x.  ( 2  x.  ( m  x.  n
) ) ) }  <-> 
( ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) ) ) ) ) )
54anbi1d 685 . . . . . 6  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( ( { A ,  B }  =  {
( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) ,  ( k  x.  ( 2  x.  ( m  x.  n
) ) ) }  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  <->  ( ( ( A  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) ) )
6 andir 838 . . . . . . 7  |-  ( ( ( ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  <->  ( ( ( A  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  \/  ( ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) ) )
7 df-3an 936 . . . . . . . 8  |-  ( ( A  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  <->  ( ( A  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) )
8 df-3an 936 . . . . . . . 8  |-  ( ( A  =  ( k  x.  ( 2  x.  ( m  x.  n
) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  <->  ( ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) )
97, 8orbi12i 507 . . . . . . 7  |-  ( ( ( A  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) )  <-> 
( ( ( A  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  \/  ( ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) ) )
106, 9bitr4i 243 . . . . . 6  |-  ( ( ( ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  <->  ( ( A  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) ) ) )
115, 10syl6bb 252 . . . . 5  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( ( { A ,  B }  =  {
( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) ,  ( k  x.  ( 2  x.  ( m  x.  n
) ) ) }  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  <->  ( ( A  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) ) ) ) )
1211rexbidv 2577 . . . 4  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( E. k  e.  NN  ( { A ,  B }  =  {
( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) ,  ( k  x.  ( 2  x.  ( m  x.  n
) ) ) }  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  <->  E. k  e.  NN  ( ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) ) ) )
13122rexbidv 2599 . . 3  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( { A ,  B }  =  {
( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) ,  ( k  x.  ( 2  x.  ( m  x.  n
) ) ) }  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  <->  E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  (
( A  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) ) ) )
14 r19.43 2708 . . . . 5  |-  ( E. k  e.  NN  (
( A  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) )  <-> 
( E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  \/  E. k  e.  NN  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) ) )
15142rexbii 2583 . . . 4  |-  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( ( A  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) ) )  <->  E. n  e.  NN  E. m  e.  NN  ( E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  \/  E. k  e.  NN  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) ) )
16 r19.43 2708 . . . . 5  |-  ( E. m  e.  NN  ( E. k  e.  NN  ( A  =  (
k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  \/  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) )  <->  ( E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  \/  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) ) )
1716rexbii 2581 . . . 4  |-  ( E. n  e.  NN  E. m  e.  NN  ( E. k  e.  NN  ( A  =  (
k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  \/  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) )  <->  E. n  e.  NN  ( E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  \/  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) ) )
18 r19.43 2708 . . . 4  |-  ( E. n  e.  NN  ( E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  \/ 
E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) )  <-> 
( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  \/  E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) ) )
1915, 17, 183bitri 262 . . 3  |-  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( ( A  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  B  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  \/  ( A  =  ( k  x.  ( 2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^ 2 )  -  ( n ^
2 ) ) )  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) ) )  <->  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  \/  E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) ) )
2013, 19syl6bb 252 . 2  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( { A ,  B }  =  {
( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) ,  ( k  x.  ( 2  x.  ( m  x.  n
) ) ) }  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  <->  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  \/  E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) ) ) )
21 pythagtriplem1 12885 . . . 4  |-  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  ->  (
( A ^ 2 )  +  ( B ^ 2 ) )  =  ( C ^
2 ) )
2221a1i 10 . . 3  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  ->  (
( A ^ 2 )  +  ( B ^ 2 ) )  =  ( C ^
2 ) ) )
23 3ancoma 941 . . . . . . 7  |-  ( ( A  =  ( k  x.  ( 2  x.  ( m  x.  n
) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  <->  ( B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) ) )
2423rexbii 2581 . . . . . 6  |-  ( E. k  e.  NN  ( A  =  ( k  x.  ( 2  x.  (
m  x.  n ) ) )  /\  B  =  ( k  x.  ( ( m ^
2 )  -  (
n ^ 2 ) ) )  /\  C  =  ( k  x.  ( ( m ^
2 )  +  ( n ^ 2 ) ) ) )  <->  E. k  e.  NN  ( B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) )
25242rexbii 2583 . . . . 5  |-  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  <->  E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) )
26 pythagtriplem1 12885 . . . . 5  |-  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  ->  (
( B ^ 2 )  +  ( A ^ 2 ) )  =  ( C ^
2 ) )
2725, 26sylbi 187 . . . 4  |-  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  ->  (
( B ^ 2 )  +  ( A ^ 2 ) )  =  ( C ^
2 ) )
28 nncn 9770 . . . . . . 7  |-  ( A  e.  NN  ->  A  e.  CC )
2928sqcld 11259 . . . . . 6  |-  ( A  e.  NN  ->  ( A ^ 2 )  e.  CC )
30 nncn 9770 . . . . . . 7  |-  ( B  e.  NN  ->  B  e.  CC )
3130sqcld 11259 . . . . . 6  |-  ( B  e.  NN  ->  ( B ^ 2 )  e.  CC )
32 addcom 9014 . . . . . 6  |-  ( ( ( A ^ 2 )  e.  CC  /\  ( B ^ 2 )  e.  CC )  -> 
( ( A ^
2 )  +  ( B ^ 2 ) )  =  ( ( B ^ 2 )  +  ( A ^
2 ) ) )
3329, 31, 32syl2an 463 . . . . 5  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( ( A ^
2 )  +  ( B ^ 2 ) )  =  ( ( B ^ 2 )  +  ( A ^
2 ) ) )
3433eqeq1d 2304 . . . 4  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( ( ( A ^ 2 )  +  ( B ^ 2 ) )  =  ( C ^ 2 )  <-> 
( ( B ^
2 )  +  ( A ^ 2 ) )  =  ( C ^ 2 ) ) )
3527, 34syl5ibr 212 . . 3  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  ->  (
( A ^ 2 )  +  ( B ^ 2 ) )  =  ( C ^
2 ) ) )
3622, 35jaod 369 . 2  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  B  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) )  \/  E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( A  =  ( k  x.  (
2  x.  ( m  x.  n ) ) )  /\  B  =  ( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) )  /\  C  =  ( k  x.  (
( m ^ 2 )  +  ( n ^ 2 ) ) ) ) )  -> 
( ( A ^
2 )  +  ( B ^ 2 ) )  =  ( C ^ 2 ) ) )
3720, 36sylbid 206 1  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( E. n  e.  NN  E. m  e.  NN  E. k  e.  NN  ( { A ,  B }  =  {
( k  x.  (
( m ^ 2 )  -  ( n ^ 2 ) ) ) ,  ( k  x.  ( 2  x.  ( m  x.  n
) ) ) }  /\  C  =  ( k  x.  ( ( m ^ 2 )  +  ( n ^
2 ) ) ) )  ->  ( ( A ^ 2 )  +  ( B ^ 2 ) )  =  ( C ^ 2 ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    \/ wo 357    /\ wa 358    /\ w3a 934    = wceq 1632    e. wcel 1696   E.wrex 2557   _Vcvv 2801   {cpr 3654  (class class class)co 5874   CCcc 8751    + caddc 8756    x. cmul 8758    - cmin 9053   NNcn 9762   2c2 9811   ^cexp 11120
This theorem is referenced by:  pythagtrip  12903
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528  ax-cnex 8809  ax-resscn 8810  ax-1cn 8811  ax-icn 8812  ax-addcl 8813  ax-addrcl 8814  ax-mulcl 8815  ax-mulrcl 8816  ax-mulcom 8817  ax-addass 8818  ax-mulass 8819  ax-distr 8820  ax-i2m1 8821  ax-1ne0 8822  ax-1rid 8823  ax-rnegex 8824  ax-rrecex 8825  ax-cnre 8826  ax-pre-lttri 8827  ax-pre-lttrn 8828  ax-pre-ltadd 8829  ax-pre-mulgt0 8830
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-nel 2462  df-ral 2561  df-rex 2562  df-reu 2563  df-rab 2565  df-v 2803  df-sbc 3005  df-csb 3095  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-pss 3181  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-tp 3661  df-op 3662  df-uni 3844  df-iun 3923  df-br 4040  df-opab 4094  df-mpt 4095  df-tr 4130  df-eprel 4321  df-id 4325  df-po 4330  df-so 4331  df-fr 4368  df-we 4370  df-ord 4411  df-on 4412  df-lim 4413  df-suc 4414  df-om 4673  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-rn 4716  df-res 4717  df-ima 4718  df-iota 5235  df-fun 5273  df-fn 5274  df-f 5275  df-f1 5276  df-fo 5277  df-f1o 5278  df-fv 5279  df-ov 5877  df-oprab 5878  df-mpt2 5879  df-2nd 6139  df-riota 6320  df-recs 6404  df-rdg 6439  df-er 6676  df-en 6880  df-dom 6881  df-sdom 6882  df-pnf 8885  df-mnf 8886  df-xr 8887  df-ltxr 8888  df-le 8889  df-sub 9055  df-neg 9056  df-nn 9763  df-2 9820  df-3 9821  df-4 9822  df-n0 9982  df-z 10041  df-uz 10247  df-seq 11063  df-exp 11121
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