Description: Finite sum closure in the log-integers. (Contributed by Mario Carneiro, 7-Apr-2016)
Ref | Expression | ||
---|---|---|---|
Hypotheses | efnnfsumcl.1 | |
|
efnnfsumcl.2 | |
||
efnnfsumcl.3 | |
||
Assertion | efnnfsumcl | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | efnnfsumcl.1 | |
|
2 | efnnfsumcl.2 | |
|
3 | efnnfsumcl.3 | |
|
4 | ssrab2 | |
|
5 | ax-resscn | |
|
6 | 4 5 | sstri | |
7 | 6 | a1i | |
8 | fveq2 | |
|
9 | 8 | eleq1d | |
10 | 9 | elrab | |
11 | fveq2 | |
|
12 | 11 | eleq1d | |
13 | 12 | elrab | |
14 | fveq2 | |
|
15 | 14 | eleq1d | |
16 | simpll | |
|
17 | simprl | |
|
18 | 16 17 | readdcld | |
19 | 16 | recnd | |
20 | 17 | recnd | |
21 | efadd | |
|
22 | 19 20 21 | syl2anc | |
23 | nnmulcl | |
|
24 | 23 | ad2ant2l | |
25 | 22 24 | eqeltrd | |
26 | 15 18 25 | elrabd | |
27 | 10 13 26 | syl2anb | |
28 | 27 | adantl | |
29 | fveq2 | |
|
30 | 29 | eleq1d | |
31 | 30 2 3 | elrabd | |
32 | 0re | |
|
33 | 1nn | |
|
34 | fveq2 | |
|
35 | ef0 | |
|
36 | 34 35 | eqtrdi | |
37 | 36 | eleq1d | |
38 | 37 | elrab | |
39 | 32 33 38 | mpbir2an | |
40 | 39 | a1i | |
41 | 7 28 1 31 40 | fsumcllem | |
42 | fveq2 | |
|
43 | 42 | eleq1d | |
44 | 43 | elrab | |
45 | 44 | simprbi | |
46 | 41 45 | syl | |