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Mirrors > Home > MPE Home > Th. List > 2m1e1 | Structured version Visualization version GIF version |
Description: 2 - 1 = 1. The result is on the right-hand-side to be consistent with similar proofs like 4p4e8 12111. (Contributed by David A. Wheeler, 4-Jan-2017.) |
Ref | Expression |
---|---|
2m1e1 | ⊢ (2 − 1) = 1 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2cn 12031 | . 2 ⊢ 2 ∈ ℂ | |
2 | ax-1cn 10913 | . 2 ⊢ 1 ∈ ℂ | |
3 | 1p1e2 12081 | . 2 ⊢ (1 + 1) = 2 | |
4 | 1, 2, 2, 3 | subaddrii 11293 | 1 ⊢ (2 − 1) = 1 |
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