| Metamath Proof Explorer |
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Related theorems Unicode version |
| Description: A function's value belongs to its codomain. |
| Ref | Expression |
|---|---|
| ffvrni.1 |
|
| Ref | Expression |
|---|---|
| ffvelrni |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ffvrni.1 |
. 2
| |
| 2 | ffvelrn 3890 |
. 2
| |
| 3 | 1, 2 | mpan 698 |
1
|