Description: The square of 7 is 49. (Contributed by SN, 26-Aug-2025)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | sq7 | ⊢ ( 7 ↑ 2 ) = ; 4 9 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 7cn | ⊢ 7 ∈ ℂ | |
| 2 | 1 | sqvali | ⊢ ( 7 ↑ 2 ) = ( 7 · 7 ) |
| 3 | 7t7e49 | ⊢ ( 7 · 7 ) = ; 4 9 | |
| 4 | 2 3 | eqtri | ⊢ ( 7 ↑ 2 ) = ; 4 9 |