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Mirrors > Home > MPE Home > Th. List > f1ofo | Structured version Visualization version GIF version |
Description: A one-to-one onto function is an onto function. (Contributed by NM, 28-Apr-2004.) |
Ref | Expression |
---|---|
f1ofo | ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–onto→𝐵) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dff1o3 6731 | . 2 ⊢ (𝐹:𝐴–1-1-onto→𝐵 ↔ (𝐹:𝐴–onto→𝐵 ∧ Fun ◡𝐹)) | |
2 | 1 | simplbi 498 | 1 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴–onto→𝐵) |
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