Theorem strsl0 13130

Description: All components of the empty set are empty sets. (Contributed by Stefan O'Rear, 27-Nov-2014.) (Revised by Jim Kingdon, 31-Jan-2023.)

Hypothesis

Ref	Expression
strsl0.e	|- ( E = Slot ( E ` ndx ) /\ ( E ` ndx ) e. NN )

Assertion

Ref	Expression
strsl0	|- (/) = ( E ` (/) )

Proof of Theorem strsl0

Step	Hyp	Ref	Expression
1		0ex 4216	. . 3 |- (/) e. _V
2		strsl0.e	. . . 4 |- ( E = Slot ( E ` ndx ) /\ ( E ` ndx ) e. NN )
3	2	simpli 111	. . 3 |- E = Slot ( E ` ndx )
4	2	simpri 113	. . 3 |- ( E ` ndx ) e. NN
5	1, 3, 4	strnfvn 13102	. 2 |- ( E ` (/) ) = ( (/) ` ( E ` ndx ) )
6		0fv 5677	. 2 |- ( (/) ` ( E ` ndx ) ) = (/)
7	5, 6	eqtr2i 2253	1 |- (/) = ( E ` (/) )

Syntax hints:   /\ wa 104   = wceq 1397   e. wcel 2202   (/)c0 3494   ` cfv 5326   NNcn 9142   ndxcnx 13078  Slot cslot 13080

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-nul 4215  ax-pow 4264  ax-pr 4299  ax-un 4530

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-iota 5286  df-fun 5328  df-fv 5334  df-slot 13085

This theorem is referenced by:  base0  13131  iedgval0  15904