Metamath Proof Explorer


Theorem psrbag

Description: Elementhood in the set of finite bags. (Contributed by Mario Carneiro, 29-Dec-2014)

Ref Expression
Hypothesis psrbag.d D=f0I|f-1Fin
Assertion psrbag IVFDF:I0F-1Fin

Proof

Step Hyp Ref Expression
1 psrbag.d D=f0I|f-1Fin
2 cnveq f=Ff-1=F-1
3 2 imaeq1d f=Ff-1=F-1
4 3 eleq1d f=Ff-1FinF-1Fin
5 4 1 elrab2 FDF0IF-1Fin
6 nn0ex 0V
7 elmapg 0VIVF0IF:I0
8 6 7 mpan IVF0IF:I0
9 8 anbi1d IVF0IF-1FinF:I0F-1Fin
10 5 9 bitrid IVFDF:I0F-1Fin