Definition df-oexp 4143

Description: Define the ordinal exponentiation operation.

Assertion

Ref	Expression
df-oexp	|- ^o = {<.<.x, y>., z>. | ((x e. On /\ y e. On) /\ z = if(x = (/), (1o \ y), (rec({<.w, v>. | v = (w .o x)}, 1o)` y)))}

Distinct variable group:   x,y,z,w,v

Detailed syntax breakdown of Definition df-oexp

Step	Hyp	Ref	Expression
1		coe 4138	. 2 class ^o
2		vx	. . . . . . 7 set x
3	2	cv 957	. . . . . 6 class x
4		con0 2954	. . . . . 6 class On
5	3, 4	wcel 960	. . . . 5 wff x e. On
6		vy	. . . . . . 7 set y
7	6	cv 957	. . . . . 6 class y
8	7, 4	wcel 960	. . . . 5 wff y e. On
9	5, 8	wa 223	. . . 4 wff (x e. On /\ y e. On)
10		vz	. . . . . 6 set z
11	10	cv 957	. . . . 5 class z
12		c0 2283	. . . . . . 7 class (/)
13	3, 12	wceq 958	. . . . . 6 wff x = (/)
14		c1o 4134	. . . . . . 7 class 1o
15	14, 7	cdif 2047	. . . . . 6 class (1o \ y)
16		vv	. . . . . . . . . . 11 set v
17	16	cv 957	. . . . . . . . . 10 class v
18		vw	. . . . . . . . . . . 12 set w
19	18	cv 957	. . . . . . . . . . 11 class w
20		comu 4137	. . . . . . . . . . 11 class .o
21	19, 3, 20	co 3969	. . . . . . . . . 10 class (w .o x)
22	17, 21	wceq 958	. . . . . . . . 9 wff v = (w .o x)
23	22, 18, 16	copab 2671	. . . . . . . 8 class {<.w, v>. | v = (w .o x)}
24	23, 14	crdg 3937	. . . . . . 7 class rec({<.w, v>. | v = (w .o x)}, 1o)
25	7, 24	cfv 3188	. . . . . 6 class (rec({<.w, v>. | v = (w .o x)}, 1o)` y)
26	13, 15, 25	cif 2365	. . . . 5 class if(x = (/), (1o \ y), (rec({<.w, v>. | v = (w .o x)}, 1o)` y))
27	11, 26	wceq 958	. . . 4 wff z = if(x = (/), (1o \ y), (rec({<.w, v>. | v = (w .o x)}, 1o)` y))
28	9, 27	wa 223	. . 3 wff ((x e. On /\ y e. On) /\ z = if(x = (/), (1o \ y), (rec({<.w, v>. | v = (w .o x)}, 1o)` y)))
29	28, 2, 6, 10	copab2 3970	. 2 class {<.<.x, y>., z>. | ((x e. On /\ y e. On) /\ z = if(x = (/), (1o \ y), (rec({<.w, v>. | v = (w .o x)}, 1o)` y)))}
30	1, 29	wceq 958	1 wff ^o = {<.<.x, y>., z>. | ((x e. On /\ y e. On) /\ z = if(x = (/), (1o \ y), (rec({<.w, v>. | v = (w .o x)}, 1o)` y)))}

This definition is referenced by:  oev 4159

Copyright terms: Public domain