Metamath Proof Explorer

Theorem rrx2pnecoorneor

Description: If two different points X and Y in a real Euclidean space of dimension 2 are different, then they are different at least at one coordinate. (Contributed by AV, 26-Feb-2023)

Ref Expression
Hypotheses rrx2pnecoorneor.i 
|- I = { 1 , 2 }
rrx2pnecoorneor.b 
|- P = ( RR ^m I )
Assertion rrx2pnecoorneor 
|- ( ( X e. P /\ Y e. P /\ X =/= Y ) -> ( ( X ` 1 ) =/= ( Y ` 1 ) \/ ( X ` 2 ) =/= ( Y ` 2 ) ) )

Proof

Step Hyp Ref Expression
1 rrx2pnecoorneor.i 
 |-  I = { 1 , 2 }
2 rrx2pnecoorneor.b 
 |-  P = ( RR ^m I )
3 1 raleqi 
 |-  ( A. i e. I ( X ` i ) = ( Y ` i ) <-> A. i e. { 1 , 2 } ( X ` i ) = ( Y ` i ) )
4 1ex 
 |-  1 e. _V
5 2ex 
 |-  2 e. _V
6 fveq2 
 |-  ( i = 1 -> ( X ` i ) = ( X ` 1 ) )
7 fveq2 
 |-  ( i = 1 -> ( Y ` i ) = ( Y ` 1 ) )
8 6 7 eqeq12d 
 |-  ( i = 1 -> ( ( X ` i ) = ( Y ` i ) <-> ( X ` 1 ) = ( Y ` 1 ) ) )
9 fveq2 
 |-  ( i = 2 -> ( X ` i ) = ( X ` 2 ) )
10 fveq2 
 |-  ( i = 2 -> ( Y ` i ) = ( Y ` 2 ) )
11 9 10 eqeq12d 
 |-  ( i = 2 -> ( ( X ` i ) = ( Y ` i ) <-> ( X ` 2 ) = ( Y ` 2 ) ) )
12 4 5 8 11 ralpr 
 |-  ( A. i e. { 1 , 2 } ( X ` i ) = ( Y ` i ) <-> ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) )
13 3 12 bitri 
 |-  ( A. i e. I ( X ` i ) = ( Y ` i ) <-> ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) )
14 13 bilanri 
 |-  ( ( ( X e. P /\ Y e. P ) /\ ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) ) -> A. i e. I ( X ` i ) = ( Y ` i ) )
15 elmapfn 
 |-  ( X e. ( RR ^m I ) -> X Fn I )
16 15 2 eleq2s 
 |-  ( X e. P -> X Fn I )
17 elmapfn 
 |-  ( Y e. ( RR ^m I ) -> Y Fn I )
18 17 2 eleq2s 
 |-  ( Y e. P -> Y Fn I )
19 16 18 anim12i 
 |-  ( ( X e. P /\ Y e. P ) -> ( X Fn I /\ Y Fn I ) )
20 19 adantr 
 |-  ( ( ( X e. P /\ Y e. P ) /\ ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) ) -> ( X Fn I /\ Y Fn I ) )
21 eqfnfv 
 |-  ( ( X Fn I /\ Y Fn I ) -> ( X = Y <-> A. i e. I ( X ` i ) = ( Y ` i ) ) )
22 20 21 syl 
 |-  ( ( ( X e. P /\ Y e. P ) /\ ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) ) -> ( X = Y <-> A. i e. I ( X ` i ) = ( Y ` i ) ) )
23 14 22 mpbird 
 |-  ( ( ( X e. P /\ Y e. P ) /\ ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) ) -> X = Y )
24 23 ex 
 |-  ( ( X e. P /\ Y e. P ) -> ( ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) -> X = Y ) )
25 24 necon3ad 
 |-  ( ( X e. P /\ Y e. P ) -> ( X =/= Y -> -. ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) ) )
26 25 3impia 
 |-  ( ( X e. P /\ Y e. P /\ X =/= Y ) -> -. ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) )
27 neorian 
 |-  ( ( ( X ` 1 ) =/= ( Y ` 1 ) \/ ( X ` 2 ) =/= ( Y ` 2 ) ) <-> -. ( ( X ` 1 ) = ( Y ` 1 ) /\ ( X ` 2 ) = ( Y ` 2 ) ) )
28 26 27 sylibr 
 |-  ( ( X e. P /\ Y e. P /\ X =/= Y ) -> ( ( X ` 1 ) =/= ( Y ` 1 ) \/ ( X ` 2 ) =/= ( Y ` 2 ) ) )