Definition df-10OLD 11087

Description: Define the number 10. See remarks under df-2 11079. (Contributed by NM, 5-Feb-2007.) Obsolete as of 9-Sep-2021. (New usage is discouraged.)

Assertion

Ref	Expression
df-10OLD	|- 10 = ( 9 + 1 )

Detailed syntax breakdown of Definition df-10OLD

Step	Hyp	Ref	Expression
1		c10 11078	. 2 class 10
2		c9 11077	. . 3 class 9
3		c1 9937	. . 3 class 1
4		caddc 9939	. . 3 class +
5	2, 3, 4	co 6650	. 2 class ( 9 + 1 )
6	1, 5	wceq 1483	1 wff 10 = ( 9 + 1 )

This definition is referenced by:  10reOLD  11109  10posOLD  11123  9p1e10OLD  11159  5p5e10OLD  11168  6p4e10OLD  11171  7p3e10OLD  11173  8p2e10OLD  11174  10nnOLD  11193  9lt10OLD  11230  decsuccOLD  11551  9p2e11OLD  11620  0.999...OLD  14613  3dvdsOLD  15053  3dvdsdecOLD  15055  3dvds2decOLD  15057