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Metamath Proof Explorer

Theorem starvndxnbasendx

Description: The slot for the involution function is not the slot for the base set in an extensible structure. Formerly part of proof for ressstarv . (Contributed by AV, 18-Oct-2024)

		Ref	Expression
	Assertion	starvndxnbasendx	⊢ ( *_𝑟 ‘ ndx ) ≠ ( Base ‘ ndx )

Proof

Step	Hyp	Ref	Expression
1		1re	⊢ 1 ∈ ℝ
2		1lt4	⊢ 1 < 4
3	1 2	gtneii	⊢ 4 ≠ 1
4		starvndx	⊢ ( *_𝑟 ‘ ndx ) = 4
5		basendx	⊢ ( Base ‘ ndx ) = 1
6	4 5	neeq12i	⊢ ( ( *_𝑟 ‘ ndx ) ≠ ( Base ‘ ndx ) ↔ 4 ≠ 1 )
7	3 6	mpbir	⊢ ( *_𝑟 ‘ ndx ) ≠ ( Base ‘ ndx )