Theorem eengbas

Description: The Base of the Euclidean geometry. (Contributed by Thierry Arnoux, 15-Mar-2019)

	Ref	Expression
Assertion	eengbas	⊢ ( 𝑁 ∈ ℕ → ( 𝔼 ‘ 𝑁 ) = ( Base ‘ ( EEG ‘ 𝑁 ) ) )

Proof

Step	Hyp	Ref	Expression
1		eengstr	⊢ ( 𝑁 ∈ ℕ → ( EEG ‘ 𝑁 ) Struct ⟨ 1 , ; 1 7 ⟩ )
2		fvexd	⊢ ( 𝑁 ∈ ℕ → ( 𝔼 ‘ 𝑁 ) ∈ V )
3		opex	⊢ ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ ∈ V
4	3	prid1	⊢ ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ ∈ { ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ , ⟨ ( dist ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( 𝔼 ‘ 𝑁 ) ↦ Σ 𝑖 ∈ ( 1 ... 𝑁 ) ( ( ( 𝑥 ‘ 𝑖 ) − ( 𝑦 ‘ 𝑖 ) ) ↑ 2 ) ) ⟩ }
5		elun1	⊢ ( ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ ∈ { ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ , ⟨ ( dist ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( 𝔼 ‘ 𝑁 ) ↦ Σ 𝑖 ∈ ( 1 ... 𝑁 ) ( ( ( 𝑥 ‘ 𝑖 ) − ( 𝑦 ‘ 𝑖 ) ) ↑ 2 ) ) ⟩ } → ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ ∈ ( { ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ , ⟨ ( dist ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( 𝔼 ‘ 𝑁 ) ↦ Σ 𝑖 ∈ ( 1 ... 𝑁 ) ( ( ( 𝑥 ‘ 𝑖 ) − ( 𝑦 ‘ 𝑖 ) ) ↑ 2 ) ) ⟩ } ∪ { ⟨ ( Itv ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( 𝔼 ‘ 𝑁 ) ↦ { 𝑧 ∈ ( 𝔼 ‘ 𝑁 ) ∣ 𝑧 Btwn ⟨ 𝑥 , 𝑦 ⟩ } ) ⟩ , ⟨ ( LineG ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( ( 𝔼 ‘ 𝑁 ) ∖ { 𝑥 } ) ↦ { 𝑧 ∈ ( 𝔼 ‘ 𝑁 ) ∣ ( 𝑧 Btwn ⟨ 𝑥 , 𝑦 ⟩ ∨ 𝑥 Btwn ⟨ 𝑧 , 𝑦 ⟩ ∨ 𝑦 Btwn ⟨ 𝑥 , 𝑧 ⟩ ) } ) ⟩ } ) )
6	4 5	ax-mp	⊢ ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ ∈ ( { ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ , ⟨ ( dist ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( 𝔼 ‘ 𝑁 ) ↦ Σ 𝑖 ∈ ( 1 ... 𝑁 ) ( ( ( 𝑥 ‘ 𝑖 ) − ( 𝑦 ‘ 𝑖 ) ) ↑ 2 ) ) ⟩ } ∪ { ⟨ ( Itv ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( 𝔼 ‘ 𝑁 ) ↦ { 𝑧 ∈ ( 𝔼 ‘ 𝑁 ) ∣ 𝑧 Btwn ⟨ 𝑥 , 𝑦 ⟩ } ) ⟩ , ⟨ ( LineG ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( ( 𝔼 ‘ 𝑁 ) ∖ { 𝑥 } ) ↦ { 𝑧 ∈ ( 𝔼 ‘ 𝑁 ) ∣ ( 𝑧 Btwn ⟨ 𝑥 , 𝑦 ⟩ ∨ 𝑥 Btwn ⟨ 𝑧 , 𝑦 ⟩ ∨ 𝑦 Btwn ⟨ 𝑥 , 𝑧 ⟩ ) } ) ⟩ } )
7		eengv	⊢ ( 𝑁 ∈ ℕ → ( EEG ‘ 𝑁 ) = ( { ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ , ⟨ ( dist ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( 𝔼 ‘ 𝑁 ) ↦ Σ 𝑖 ∈ ( 1 ... 𝑁 ) ( ( ( 𝑥 ‘ 𝑖 ) − ( 𝑦 ‘ 𝑖 ) ) ↑ 2 ) ) ⟩ } ∪ { ⟨ ( Itv ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( 𝔼 ‘ 𝑁 ) ↦ { 𝑧 ∈ ( 𝔼 ‘ 𝑁 ) ∣ 𝑧 Btwn ⟨ 𝑥 , 𝑦 ⟩ } ) ⟩ , ⟨ ( LineG ‘ ndx ) , ( 𝑥 ∈ ( 𝔼 ‘ 𝑁 ) , 𝑦 ∈ ( ( 𝔼 ‘ 𝑁 ) ∖ { 𝑥 } ) ↦ { 𝑧 ∈ ( 𝔼 ‘ 𝑁 ) ∣ ( 𝑧 Btwn ⟨ 𝑥 , 𝑦 ⟩ ∨ 𝑥 Btwn ⟨ 𝑧 , 𝑦 ⟩ ∨ 𝑦 Btwn ⟨ 𝑥 , 𝑧 ⟩ ) } ) ⟩ } ) )
8	6 7	eleqtrrid	⊢ ( 𝑁 ∈ ℕ → ⟨ ( Base ‘ ndx ) , ( 𝔼 ‘ 𝑁 ) ⟩ ∈ ( EEG ‘ 𝑁 ) )
9	1 2 8	opelstrbas	⊢ ( 𝑁 ∈ ℕ → ( 𝔼 ‘ 𝑁 ) = ( Base ‘ ( EEG ‘ 𝑁 ) ) )