Theorem 2exp4

Description: Two to the fourth power is 16. (Contributed by Mario Carneiro, 20-Apr-2015)

	Ref	Expression
Assertion	2exp4	⊢ ( 2 ↑ 4 ) = ; 1 6

Proof

Step	Hyp	Ref	Expression
1		2nn0	⊢ 2 ∈ ℕ0
2		2t2e4	⊢ ( 2 · 2 ) = 4
3		sq2	⊢ ( 2 ↑ 2 ) = 4
4		4t4e16	⊢ ( 4 · 4 ) = ; 1 6
5	1 1 2 3 4	numexp2x	⊢ ( 2 ↑ 4 ) = ; 1 6