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Theorem pythagtriplem2 14191
Description: Lemma for pythagtrip 14208. 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 6302 . . . . . . . 8  |-  ( k  x.  ( ( m ^ 2 )  -  ( n ^ 2 ) ) )  e. 
_V
2 ovex 6302 . . . . . . . 8  |-  ( k  x.  ( 2  x.  ( m  x.  n
) ) )  e. 
_V
3 preq12bg 4200 . . . . . . . 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 685 . . . . . . 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 704 . . . . . 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 864 . . . . . . 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 970 . . . . . . . 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 970 . . . . . . . 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 521 . . . . . . 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 252 . . . . . 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 261 . . . . 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 2968 . . . 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 2975 . . 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 3012 . . . . 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 2961 . . . 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 3012 . . . . 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 2960 . . . 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 3012 . . . 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 271 . . 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 261 . 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 14190 . . . 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 11 . . 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 975 . . . . . . 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 2960 . . . . . 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 2961 . . . . 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 14190 . . . . 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 195 . . . 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 10535 . . . . . . 7  |-  ( A  e.  NN  ->  A  e.  CC )
2928sqcld 12265 . . . . . 6  |-  ( A  e.  NN  ->  ( A ^ 2 )  e.  CC )
30 nncn 10535 . . . . . . 7  |-  ( B  e.  NN  ->  B  e.  CC )
3130sqcld 12265 . . . . . 6  |-  ( B  e.  NN  ->  ( B ^ 2 )  e.  CC )
32 addcom 9756 . . . . . 6  |-  ( ( ( A ^ 2 )  e.  CC  /\  ( B ^ 2 )  e.  CC )  -> 
( ( A ^
2 )  +  ( B ^ 2 ) )  =  ( ( B ^ 2 )  +  ( A ^
2 ) ) )
3329, 31, 32syl2an 477 . . . . 5  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( ( A ^
2 )  +  ( B ^ 2 ) )  =  ( ( B ^ 2 )  +  ( A ^
2 ) ) )
3433eqeq1d 2464 . . . 4  |-  ( ( A  e.  NN  /\  B  e.  NN )  ->  ( ( ( A ^ 2 )  +  ( B ^ 2 ) )  =  ( C ^ 2 )  <-> 
( ( B ^
2 )  +  ( A ^ 2 ) )  =  ( C ^ 2 ) ) )
3527, 34syl5ibr 221 . . 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 380 . 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 215 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 setvar class
Syntax hints:    -> wi 4    <-> wb 184    \/ wo 368    /\ wa 369    /\ w3a 968    = wceq 1374    e. wcel 1762   E.wrex 2810   _Vcvv 3108   {cpr 4024  (class class class)co 6277   CCcc 9481    + caddc 9486    x. cmul 9488    - cmin 9796   NNcn 10527   2c2 10576   ^cexp 12124
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1596  ax-4 1607  ax-5 1675  ax-6 1714  ax-7 1734  ax-8 1764  ax-9 1766  ax-10 1781  ax-11 1786  ax-12 1798  ax-13 1963  ax-ext 2440  ax-sep 4563  ax-nul 4571  ax-pow 4620  ax-pr 4681  ax-un 6569  ax-cnex 9539  ax-resscn 9540  ax-1cn 9541  ax-icn 9542  ax-addcl 9543  ax-addrcl 9544  ax-mulcl 9545  ax-mulrcl 9546  ax-mulcom 9547  ax-addass 9548  ax-mulass 9549  ax-distr 9550  ax-i2m1 9551  ax-1ne0 9552  ax-1rid 9553  ax-rnegex 9554  ax-rrecex 9555  ax-cnre 9556  ax-pre-lttri 9557  ax-pre-lttrn 9558  ax-pre-ltadd 9559  ax-pre-mulgt0 9560
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-3or 969  df-3an 970  df-tru 1377  df-ex 1592  df-nf 1595  df-sb 1707  df-eu 2274  df-mo 2275  df-clab 2448  df-cleq 2454  df-clel 2457  df-nfc 2612  df-ne 2659  df-nel 2660  df-ral 2814  df-rex 2815  df-reu 2816  df-rab 2818  df-v 3110  df-sbc 3327  df-csb 3431  df-dif 3474  df-un 3476  df-in 3478  df-ss 3485  df-pss 3487  df-nul 3781  df-if 3935  df-pw 4007  df-sn 4023  df-pr 4025  df-tp 4027  df-op 4029  df-uni 4241  df-iun 4322  df-br 4443  df-opab 4501  df-mpt 4502  df-tr 4536  df-eprel 4786  df-id 4790  df-po 4795  df-so 4796  df-fr 4833  df-we 4835  df-ord 4876  df-on 4877  df-lim 4878  df-suc 4879  df-xp 5000  df-rel 5001  df-cnv 5002  df-co 5003  df-dm 5004  df-rn 5005  df-res 5006  df-ima 5007  df-iota 5544  df-fun 5583  df-fn 5584  df-f 5585  df-f1 5586  df-fo 5587  df-f1o 5588  df-fv 5589  df-riota 6238  df-ov 6280  df-oprab 6281  df-mpt2 6282  df-om 6674  df-2nd 6777  df-recs 7034  df-rdg 7068  df-er 7303  df-en 7509  df-dom 7510  df-sdom 7511  df-pnf 9621  df-mnf 9622  df-xr 9623  df-ltxr 9624  df-le 9625  df-sub 9798  df-neg 9799  df-nn 10528  df-2 10585  df-3 10586  df-4 10587  df-n0 10787  df-z 10856  df-uz 11074  df-seq 12066  df-exp 12125
This theorem is referenced by:  pythagtrip  14208
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