Description: The first quadrant solutions are precisely the positive Pell solutions which are at least one. (Contributed by Stefan O'Rear, 18-Sep-2014)
Ref | Expression | ||
---|---|---|---|
Assertion | elpell1qr2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pell1qrss14 | |
|
2 | 1 | sselda | |
3 | pell1qrge1 | |
|
4 | 2 3 | jca | |
5 | 1red | |
|
6 | pell14qrre | |
|
7 | 5 6 | leloed | |
8 | 5 6 | ltnled | |
9 | 8 | biimpa | |
10 | 1div1e1 | |
|
11 | 10 | eqcomi | |
12 | 11 | a1i | |
13 | 12 | breq2d | |
14 | 6 | adantr | |
15 | pell14qrgt0 | |
|
16 | 15 | adantr | |
17 | 1red | |
|
18 | 0lt1 | |
|
19 | 18 | a1i | |
20 | lerec2 | |
|
21 | 14 16 17 19 20 | syl22anc | |
22 | 13 21 | bitrd | |
23 | 9 22 | mtbid | |
24 | simplll | |
|
25 | pell1qrge1 | |
|
26 | 24 25 | sylancom | |
27 | 23 26 | mtand | |
28 | pell14qrdich | |
|
29 | 28 | adantr | |
30 | orel2 | |
|
31 | 27 29 30 | sylc | |
32 | simpr | |
|
33 | pell1qr1 | |
|
34 | 33 | ad2antrr | |
35 | 32 34 | eqeltrrd | |
36 | 31 35 | jaodan | |
37 | 36 | ex | |
38 | 7 37 | sylbid | |
39 | 38 | impr | |
40 | 4 39 | impbida | |