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Mirrors > Home > ILE Home > Th. List > df-f1o | GIF version |
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.) |
Ref | Expression |
---|---|
df-f1o | ⊢ (𝐹:𝐴–1-1-onto→𝐵 ↔ (𝐹:𝐴–1-1→𝐵 ∧ 𝐹:𝐴–onto→𝐵)) |
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)) |
Colors of variables: wff set class |
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 9649 1arith 12364 xpsff1o 12767 reeff1o 14164 ioocosf1o 14245 |
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