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Mirrors > Home > MPE Home > Th. List > undefval | Structured version Visualization version GIF version |
Description: Value of the undefined value function. Normally we will not reference the explicit value but will use undefnel 8213 instead. (Contributed by NM, 15-Sep-2011.) (Revised by Mario Carneiro, 24-Dec-2016.) |
Ref | Expression |
---|---|
undefval | β’ (π β π β (Undefβπ) = π« βͺ π) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-undef 8208 | . 2 β’ Undef = (π β V β¦ π« βͺ π ) | |
2 | unieq 4880 | . . 3 β’ (π = π β βͺ π = βͺ π) | |
3 | 2 | pweqd 4581 | . 2 β’ (π = π β π« βͺ π = π« βͺ π) |
4 | elex 3465 | . 2 β’ (π β π β π β V) | |
5 | uniexg 7681 | . . 3 β’ (π β π β βͺ π β V) | |
6 | 5 | pwexd 5338 | . 2 β’ (π β π β π« βͺ π β V) |
7 | 1, 3, 4, 6 | fvmptd3 6975 | 1 β’ (π β π β (Undefβπ) = π« βͺ π) |
Colors of variables: wff setvar class |
Syntax hints: β wi 4 = wceq 1542 β wcel 2107 Vcvv 3447 π« cpw 4564 βͺ cuni 4869 βcfv 6500 Undefcund 8207 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-sep 5260 ax-nul 5267 ax-pow 5324 ax-pr 5388 ax-un 7676 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ral 3062 df-rex 3071 df-rab 3407 df-v 3449 df-dif 3917 df-un 3919 df-in 3921 df-ss 3931 df-nul 4287 df-if 4491 df-pw 4566 df-sn 4591 df-pr 4593 df-op 4597 df-uni 4870 df-br 5110 df-opab 5172 df-mpt 5193 df-id 5535 df-xp 5643 df-rel 5644 df-cnv 5645 df-co 5646 df-dm 5647 df-iota 6452 df-fun 6502 df-fv 6508 df-undef 8208 |
This theorem is referenced by: undefnel2 8212 undefne0 8214 ndfatafv2undef 45534 |
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