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| Description: The exponential function is continuous. (Contributed by Paul Chapman, 15-Sep-2007.) |
| Ref | Expression |
|---|---|
| efcn |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssid 2070 |
. . 3
| |
| 2 | elcncf 7200 |
. . 3
| |
| 3 | 1, 1, 2 | mp2an 695 |
. 2
|
| 4 | eff 7255 |
. 2
| |
| 5 | breq2 2613 |
. . . . . . 7
| |
| 6 | imbi1 621 |
. . . . . . 7
| |
| 7 | imbi2 622 |
. . . . . . 7
| |
| 8 | 5, 6, 7 | 3syl 20 |
. . . . . 6
|
| 9 | 8 | ralbidv2 1657 |
. . . . 5
|
| 10 | 9 | rcla4ev 1868 |
. . . 4
|
| 11 | redivclt 5756 |
. . . . . . 7
| |
| 12 | pm3.27 323 |
. . . . . . . . 9
| |
| 13 | elrp 6220 |
. . . . . . . . 9
| |
| 14 | 12, 13 | sylib 198 |
. . . . . . . 8
|
| 15 | 14 | pm3.26d 321 |
. . . . . . 7
|
| 16 | axaddrcl 5244 |
. . . . . . . 8
| |
| 17 | efclt 7254 |
. . . . . . . . . 10
| |
| 18 | absclt 6768 |
. . . . . . . . . 10
| |
| 19 | 17, 18 | syl 10 |
. . . . . . . . 9
|
| 20 | 19 | adantr 389 |
. . . . . . . 8
|
| 21 | 16, 20, 15 | sylanc 471 |
. . . . . . 7
|
| 22 | gt0ne0t 5592 |
. . . . . . . 8
| |
| 23 | addgt0t 5620 |
. . . . . . . . 9
| |
| 24 | efne0t 7311 |
. . . . . . . . . . 11
| |
| 25 | absgt0t 6831 |
. . . . . . . . . . . 12
| |
| 26 | 17, 25 | syl 10 |
. . . . . . . . . . 11
|
| 27 | 24, 26 | mpbid 195 |
. . . . . . . . . 10
|
| 28 | 27 | adantr 389 |
. . . . . . . . 9
|
| 29 | 14 | pm3.27d 325 |
. . . . . . . . 9
|
| 30 | 23, 20, 15, 28, 29 | syl2anc 472 |
. . . . . . . 8
|
| 31 | 22, 21, 30 | sylanc 471 |
. . . . . . 7
|
| 32 | 11, 15, 21, 31 | syl3anc 856 |
. . . . . 6
|
| 33 | divgt0t 5809 |
. . . . . . 7
| |
| 34 | 21, 30 | jca 288 |
. . . . . . 7
|
| 35 | 33, 14, 34 | sylanc 471 |
. . . . . 6
|
| 36 | 32, 35 | jca 288 |
. . . . 5
|
| 37 | elrp 6220 |
. . . . 5
| |
| 38 | 36, 37 | sylibr 200 |
. . . 4
|
| 39 | 3ancoma 780 |
. . . . . . . 8
| |
| 40 | 13 | 3anbi3i 824 |
. . . . . . . 8
|
| 41 | 3anass 777 |
. . . . . . . 8
| |
| 42 | 39, 40, 41 | 3bitr3 181 |
. . . . . . 7
|
| 43 | efcnlem4 7362 |
. . . . . . 7
| |
| 44 | 42, 43 | sylbir 201 |
. . . . . 6
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