Description: If K divides N but K does not divide M then M + N cannot be zero. (Contributed by Glauco Siliprandi, 5-Apr-2020)
Ref | Expression | ||
---|---|---|---|
Hypotheses | etransclem9.k | |
|
etransclem9.kn0 | |
||
etransclem9.m | |
||
etransclem9.n | |
||
etransclem9.km | |
||
etransclem9.kn | |
||
Assertion | etransclem9 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | etransclem9.k | |
|
2 | etransclem9.kn0 | |
|
3 | etransclem9.m | |
|
4 | etransclem9.n | |
|
5 | etransclem9.km | |
|
6 | etransclem9.kn | |
|
7 | dvdsval2 | |
|
8 | 1 2 3 7 | syl3anc | |
9 | 5 8 | mtbid | |
10 | df-neg | |
|
11 | 10 | a1i | |
12 | oveq1 | |
|
13 | 12 | eqcomd | |
14 | 13 | adantl | |
15 | 3 | zcnd | |
16 | 4 | zcnd | |
17 | 15 16 | pncand | |
18 | 17 | adantr | |
19 | 11 14 18 | 3eqtrrd | |
20 | 19 | oveq1d | |
21 | dvdsnegb | |
|
22 | 1 4 21 | syl2anc | |
23 | 6 22 | mpbid | |
24 | 4 | znegcld | |
25 | dvdsval2 | |
|
26 | 1 2 24 25 | syl3anc | |
27 | 23 26 | mpbid | |
28 | 27 | adantr | |
29 | 20 28 | eqeltrd | |
30 | 9 29 | mtand | |
31 | 30 | neqned | |