df-3o - Metamath Proof Explorer

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Definition df-3o 7723

Description: Define the ordinal number 3. (Contributed by Mario Carneiro, 14-Jul-2013.)

**Assertion**
Ref	Expression
df-3o	⊢ 3_𝑜 = suc 2_𝑜

**Detailed syntax breakdown of Definition df-3o**
Step	Hyp	Ref	Expression
1		c3o 7716	. 2 class 3_𝑜
2		c2o 7715	. . 3 class 2_𝑜
3	2	csuc 5878	. 2 class suc 2_𝑜
4	1, 3	wceq 1624	1 wff 3_𝑜 = suc 2_𝑜

Colors of variables: wff setvar class

This definition is referenced by: 3on 7731 o2p2e4 7782 3onn 7882 en3 8354 hash3 13378 finxp3o 33540 df3o2 38816 df3o3 38817 clsk1independent 38838