Definition df-f1o 5261

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 5253	. 2 wff F : A -1-1-onto-> B
5	1, 2, 3	wf1 5251	. . 3 wff F : A -1-1-> B
6	1, 2, 3	wfo 5252	. . 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  5488  f1oeq2  5489  f1oeq3  5490  nff1o  5498  f1of1  5499  dff1o2  5505  dff1o5  5509  f1oco  5523  fo00  5536  dff1o6  5819  fcof1o  5832  tposf1o2  6323  cnref1o  9716  1arith  12505  xpsff1o  12932  znf1o  14139  reeff1o  14908  ioocosf1o  14989  gausslemma2dlem1f1o  15176