Theorem
nfsv
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index
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theorem nfsv (A: set) {x: nat}: $ FS/ x A $;
Step
Hyp
Ref
Expression
1
nfv
F/ x y e. A
2
1
ax_gen
A. y (F/ x y e. A)
3
2
conv
nfs
FS/ x A
Axiom use
axs_pred_calc
(
ax_gen
,
ax_5
)