Theorem 2exp4

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

	Ref	Expression
Assertion	2exp4	$$⊢2^4=16$$

Proof

Step	Hyp	Ref	Expression
1		2nn0	$$⊢2\in {\mathbb{N}}_0$$
2		2t2e4	$$⊢2\cdot 2=4$$
3		sq2	$$⊢2^2=4$$
4		4t4e16	$$⊢4\cdot 4=16$$
5	1 1 2 3 4	numexp2x	$$⊢2^4=16$$