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Description: Two ways to say that a function on the nonnegative integers has finite support. (Contributed by Mario Carneiro, 22-Jul-2014)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | plyco0 | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } <-> A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | simprr | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( A ` k ) =/= 0 ) |
|
| 2 | ffun | |- ( A : NN0 --> CC -> Fun A ) |
|
| 3 | 2 | adantl | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> Fun A ) |
| 4 | peano2nn0 | |- ( N e. NN0 -> ( N + 1 ) e. NN0 ) |
|
| 5 | 4 | adantr | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( N + 1 ) e. NN0 ) |
| 6 | eluznn0 | |- ( ( ( N + 1 ) e. NN0 /\ k e. ( ZZ>= ` ( N + 1 ) ) ) -> k e. NN0 ) |
|
| 7 | 6 | ex | |- ( ( N + 1 ) e. NN0 -> ( k e. ( ZZ>= ` ( N + 1 ) ) -> k e. NN0 ) ) |
| 8 | 5 7 | syl | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( k e. ( ZZ>= ` ( N + 1 ) ) -> k e. NN0 ) ) |
| 9 | 8 | ssrdv | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( ZZ>= ` ( N + 1 ) ) C_ NN0 ) |
| 10 | fdm | |- ( A : NN0 --> CC -> dom A = NN0 ) |
|
| 11 | 10 | adantl | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> dom A = NN0 ) |
| 12 | 9 11 | sseqtrrd | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( ZZ>= ` ( N + 1 ) ) C_ dom A ) |
| 13 | funfvima2 | |- ( ( Fun A /\ ( ZZ>= ` ( N + 1 ) ) C_ dom A ) -> ( k e. ( ZZ>= ` ( N + 1 ) ) -> ( A ` k ) e. ( A " ( ZZ>= ` ( N + 1 ) ) ) ) ) |
|
| 14 | 3 12 13 | syl2anc | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( k e. ( ZZ>= ` ( N + 1 ) ) -> ( A ` k ) e. ( A " ( ZZ>= ` ( N + 1 ) ) ) ) ) |
| 15 | 14 | ad2antrr | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( k e. ( ZZ>= ` ( N + 1 ) ) -> ( A ` k ) e. ( A " ( ZZ>= ` ( N + 1 ) ) ) ) ) |
| 16 | nn0z | |- ( N e. NN0 -> N e. ZZ ) |
|
| 17 | 16 | adantr | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> N e. ZZ ) |
| 18 | 17 | peano2zd | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( N + 1 ) e. ZZ ) |
| 19 | 18 | ad2antrr | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( N + 1 ) e. ZZ ) |
| 20 | nn0z | |- ( k e. NN0 -> k e. ZZ ) |
|
| 21 | 20 | ad2antrl | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> k e. ZZ ) |
| 22 | eluz | |- ( ( ( N + 1 ) e. ZZ /\ k e. ZZ ) -> ( k e. ( ZZ>= ` ( N + 1 ) ) <-> ( N + 1 ) <_ k ) ) |
|
| 23 | 19 21 22 | syl2anc | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( k e. ( ZZ>= ` ( N + 1 ) ) <-> ( N + 1 ) <_ k ) ) |
| 24 | simplr | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) |
|
| 25 | 24 | eleq2d | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( ( A ` k ) e. ( A " ( ZZ>= ` ( N + 1 ) ) ) <-> ( A ` k ) e. { 0 } ) ) |
| 26 | fvex | |- ( A ` k ) e. _V |
|
| 27 | 26 | elsn | |- ( ( A ` k ) e. { 0 } <-> ( A ` k ) = 0 ) |
| 28 | 25 27 | bitrdi | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( ( A ` k ) e. ( A " ( ZZ>= ` ( N + 1 ) ) ) <-> ( A ` k ) = 0 ) ) |
| 29 | 15 23 28 | 3imtr3d | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( ( N + 1 ) <_ k -> ( A ` k ) = 0 ) ) |
| 30 | 29 | necon3ad | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( ( A ` k ) =/= 0 -> -. ( N + 1 ) <_ k ) ) |
| 31 | 1 30 | mpd | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> -. ( N + 1 ) <_ k ) |
| 32 | nn0re | |- ( k e. NN0 -> k e. RR ) |
|
| 33 | 32 | ad2antrl | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> k e. RR ) |
| 34 | 18 | zred | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( N + 1 ) e. RR ) |
| 35 | 34 | ad2antrr | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( N + 1 ) e. RR ) |
| 36 | 33 35 | ltnled | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( k < ( N + 1 ) <-> -. ( N + 1 ) <_ k ) ) |
| 37 | 31 36 | mpbird | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> k < ( N + 1 ) ) |
| 38 | 17 | ad2antrr | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> N e. ZZ ) |
| 39 | zleltp1 | |- ( ( k e. ZZ /\ N e. ZZ ) -> ( k <_ N <-> k < ( N + 1 ) ) ) |
|
| 40 | 21 38 39 | syl2anc | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> ( k <_ N <-> k < ( N + 1 ) ) ) |
| 41 | 37 40 | mpbird | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ ( k e. NN0 /\ ( A ` k ) =/= 0 ) ) -> k <_ N ) |
| 42 | 41 | expr | |- ( ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) /\ k e. NN0 ) -> ( ( A ` k ) =/= 0 -> k <_ N ) ) |
| 43 | 42 | ralrimiva | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) -> A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) |
| 44 | simpr | |- ( ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) -> n e. ( ZZ>= ` ( N + 1 ) ) ) |
|
| 45 | eluznn0 | |- ( ( ( N + 1 ) e. NN0 /\ n e. ( ZZ>= ` ( N + 1 ) ) ) -> n e. NN0 ) |
|
| 46 | 5 44 45 | syl2an | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> n e. NN0 ) |
| 47 | nn0re | |- ( N e. NN0 -> N e. RR ) |
|
| 48 | 47 | adantr | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> N e. RR ) |
| 49 | 48 | adantr | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> N e. RR ) |
| 50 | 34 | adantr | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> ( N + 1 ) e. RR ) |
| 51 | 46 | nn0red | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> n e. RR ) |
| 52 | 49 | ltp1d | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> N < ( N + 1 ) ) |
| 53 | eluzle | |- ( n e. ( ZZ>= ` ( N + 1 ) ) -> ( N + 1 ) <_ n ) |
|
| 54 | 53 | ad2antll | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> ( N + 1 ) <_ n ) |
| 55 | 49 50 51 52 54 | ltletrd | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> N < n ) |
| 56 | 49 51 | ltnled | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> ( N < n <-> -. n <_ N ) ) |
| 57 | 55 56 | mpbid | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> -. n <_ N ) |
| 58 | fveq2 | |- ( k = n -> ( A ` k ) = ( A ` n ) ) |
|
| 59 | 58 | neeq1d | |- ( k = n -> ( ( A ` k ) =/= 0 <-> ( A ` n ) =/= 0 ) ) |
| 60 | breq1 | |- ( k = n -> ( k <_ N <-> n <_ N ) ) |
|
| 61 | 59 60 | imbi12d | |- ( k = n -> ( ( ( A ` k ) =/= 0 -> k <_ N ) <-> ( ( A ` n ) =/= 0 -> n <_ N ) ) ) |
| 62 | simprl | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) |
|
| 63 | 61 62 46 | rspcdva | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> ( ( A ` n ) =/= 0 -> n <_ N ) ) |
| 64 | 63 | necon1bd | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> ( -. n <_ N -> ( A ` n ) = 0 ) ) |
| 65 | 57 64 | mpd | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> ( A ` n ) = 0 ) |
| 66 | ffn | |- ( A : NN0 --> CC -> A Fn NN0 ) |
|
| 67 | 66 | ad2antlr | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> A Fn NN0 ) |
| 68 | fniniseg | |- ( A Fn NN0 -> ( n e. ( `' A " { 0 } ) <-> ( n e. NN0 /\ ( A ` n ) = 0 ) ) ) |
|
| 69 | 67 68 | syl | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> ( n e. ( `' A " { 0 } ) <-> ( n e. NN0 /\ ( A ` n ) = 0 ) ) ) |
| 70 | 46 65 69 | mpbir2and | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ ( A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) /\ n e. ( ZZ>= ` ( N + 1 ) ) ) ) -> n e. ( `' A " { 0 } ) ) |
| 71 | 70 | expr | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( n e. ( ZZ>= ` ( N + 1 ) ) -> n e. ( `' A " { 0 } ) ) ) |
| 72 | 71 | ssrdv | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( ZZ>= ` ( N + 1 ) ) C_ ( `' A " { 0 } ) ) |
| 73 | funimass3 | |- ( ( Fun A /\ ( ZZ>= ` ( N + 1 ) ) C_ dom A ) -> ( ( A " ( ZZ>= ` ( N + 1 ) ) ) C_ { 0 } <-> ( ZZ>= ` ( N + 1 ) ) C_ ( `' A " { 0 } ) ) ) |
|
| 74 | 3 12 73 | syl2anc | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( ( A " ( ZZ>= ` ( N + 1 ) ) ) C_ { 0 } <-> ( ZZ>= ` ( N + 1 ) ) C_ ( `' A " { 0 } ) ) ) |
| 75 | 74 | adantr | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( ( A " ( ZZ>= ` ( N + 1 ) ) ) C_ { 0 } <-> ( ZZ>= ` ( N + 1 ) ) C_ ( `' A " { 0 } ) ) ) |
| 76 | 72 75 | mpbird | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( A " ( ZZ>= ` ( N + 1 ) ) ) C_ { 0 } ) |
| 77 | 48 | ltp1d | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> N < ( N + 1 ) ) |
| 78 | 48 34 | ltnled | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( N < ( N + 1 ) <-> -. ( N + 1 ) <_ N ) ) |
| 79 | 77 78 | mpbid | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> -. ( N + 1 ) <_ N ) |
| 80 | 79 | adantr | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> -. ( N + 1 ) <_ N ) |
| 81 | fveq2 | |- ( k = ( N + 1 ) -> ( A ` k ) = ( A ` ( N + 1 ) ) ) |
|
| 82 | 81 | neeq1d | |- ( k = ( N + 1 ) -> ( ( A ` k ) =/= 0 <-> ( A ` ( N + 1 ) ) =/= 0 ) ) |
| 83 | breq1 | |- ( k = ( N + 1 ) -> ( k <_ N <-> ( N + 1 ) <_ N ) ) |
|
| 84 | 82 83 | imbi12d | |- ( k = ( N + 1 ) -> ( ( ( A ` k ) =/= 0 -> k <_ N ) <-> ( ( A ` ( N + 1 ) ) =/= 0 -> ( N + 1 ) <_ N ) ) ) |
| 85 | 84 | rspcva | |- ( ( ( N + 1 ) e. NN0 /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( ( A ` ( N + 1 ) ) =/= 0 -> ( N + 1 ) <_ N ) ) |
| 86 | 5 85 | sylan | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( ( A ` ( N + 1 ) ) =/= 0 -> ( N + 1 ) <_ N ) ) |
| 87 | 86 | necon1bd | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( -. ( N + 1 ) <_ N -> ( A ` ( N + 1 ) ) = 0 ) ) |
| 88 | 80 87 | mpd | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( A ` ( N + 1 ) ) = 0 ) |
| 89 | uzid | |- ( ( N + 1 ) e. ZZ -> ( N + 1 ) e. ( ZZ>= ` ( N + 1 ) ) ) |
|
| 90 | 18 89 | syl | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( N + 1 ) e. ( ZZ>= ` ( N + 1 ) ) ) |
| 91 | funfvima2 | |- ( ( Fun A /\ ( ZZ>= ` ( N + 1 ) ) C_ dom A ) -> ( ( N + 1 ) e. ( ZZ>= ` ( N + 1 ) ) -> ( A ` ( N + 1 ) ) e. ( A " ( ZZ>= ` ( N + 1 ) ) ) ) ) |
|
| 92 | 3 12 91 | syl2anc | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( ( N + 1 ) e. ( ZZ>= ` ( N + 1 ) ) -> ( A ` ( N + 1 ) ) e. ( A " ( ZZ>= ` ( N + 1 ) ) ) ) ) |
| 93 | 90 92 | mpd | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( A ` ( N + 1 ) ) e. ( A " ( ZZ>= ` ( N + 1 ) ) ) ) |
| 94 | 93 | adantr | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( A ` ( N + 1 ) ) e. ( A " ( ZZ>= ` ( N + 1 ) ) ) ) |
| 95 | 88 94 | eqeltrrd | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> 0 e. ( A " ( ZZ>= ` ( N + 1 ) ) ) ) |
| 96 | 95 | snssd | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> { 0 } C_ ( A " ( ZZ>= ` ( N + 1 ) ) ) ) |
| 97 | 76 96 | eqssd | |- ( ( ( N e. NN0 /\ A : NN0 --> CC ) /\ A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) -> ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } ) |
| 98 | 43 97 | impbida | |- ( ( N e. NN0 /\ A : NN0 --> CC ) -> ( ( A " ( ZZ>= ` ( N + 1 ) ) ) = { 0 } <-> A. k e. NN0 ( ( A ` k ) =/= 0 -> k <_ N ) ) ) |