Definition df-f1o 5223

Description: Define a one-to-one onto function. Compare Definition 6.15(6) of [TakeutiZaring] p. 27. We use their notation ("1-1" above the arrow and "onto" below the arrow). (Contributed by NM, 1-Aug-1994.)

Assertion

Ref	Expression
df-f1o	|- ( F : A -1-1-onto-> B <-> ( F : A -1-1-> B /\ F : A -onto-> B ) )

Detailed syntax breakdown of Definition df-f1o

Step	Hyp	Ref	Expression
1		cA	. . 3 class A
2		cB	. . 3 class B
3		cF	. . 3 class F
4	1, 2, 3	wf1o 5215	. 2 wff F : A -1-1-onto-> B
5	1, 2, 3	wf1 5213	. . 3 wff F : A -1-1-> B
6	1, 2, 3	wfo 5214	. . 3 wff F : A -onto-> B
7	5, 6	wa 104	. 2 wff ( F : A -1-1-> B /\ F : A -onto-> B )
8	4, 7	wb 105	1 wff ( F : A -1-1-onto-> B <-> ( F : A -1-1-> B /\ F : A -onto-> B ) )

This definition is referenced by:  f1oeq1  5449  f1oeq2  5450  f1oeq3  5451  nff1o  5459  f1of1  5460  dff1o2  5466  dff1o5  5470  f1oco  5484  fo00  5497  dff1o6  5776  fcof1o  5789  tposf1o2  6270  cnref1o  9648  1arith  12359  reeff1o  14087  ioocosf1o  14168