Theorem num0u

Description: Add a zero in the units place. (Contributed by Mario Carneiro, 18-Feb-2014)

	Ref	Expression
Hypotheses	numnncl.1	|- T e. NN0
	numnncl.2	|- A e. NN0
Assertion	num0u	|- ( T x. A ) = ( ( T x. A ) + 0 )

Proof

Step	Hyp	Ref	Expression
1		numnncl.1	|- T e. NN0
2		numnncl.2	|- A e. NN0
3	1 2	nn0mulcli	|- ( T x. A ) e. NN0
4	3	nn0cni	|- ( T x. A ) e. CC
5	4	addridi	|- ( ( T x. A ) + 0 ) = ( T x. A )
6	5	eqcomi	|- ( T x. A ) = ( ( T x. A ) + 0 )