Theorem nfsv | index | src |

theorem nfsv (A: set) {x: nat}: $ FS/ x A $;
StepHypRefExpression
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)