Copeland

Violation of Strategy Proofness

Profile type: ProfileWithTies
Config: 4 c, 2 v
Parameters: ∅

Violation of Strategy-Proofness for Copeland under the single-winner set preference.
A voter can benefit by changing their ranking from ( 1  2 ) 3 0  to 1 2 ( 0  3 ) .

Original Profile:
+-----+-----+
|  1  |  1  |
+-----+-----+
| 0 3 | 1 2 |
| 1 2 |  3  |
|     |  0  |
|     |     |
+-----+-----+
ProfileWithTies([{1: 1, 2: 1, 0: 0, 3: 0}, {0: 2, 3: 1, 1: 0, 2: 0}], rcounts=[1, 1], cmap={0: 0, 1: 1, 2: 2, 3: 3})

Copeland winner is {3}

New Profile:
+-----+-----+
|  1  |  1  |
+-----+-----+
| 0 3 |  1  |
| 1 2 |  2  |
|     | 0 3 |
|     |     |
+-----+-----+
ProfileWithTies([{1: 1, 2: 1, 0: 0, 3: 0}, {0: 2, 3: 2, 2: 1, 1: 0}], rcounts=[1, 1], cmap={0: '0', 1: '1', 2: '2', 3: '3'})

Copeland winner is {1}