| | Round Squares Are No Contradictions (Tutorial on Negation Contradiction and Opposition), p. 45, by Beziau, Jean-Yves | 2015 | Classical Sigma-2 | 3 | Square |
| | Round Squares Are No Contradictions (Tutorial on Negation Contradiction and Opposition), p. 51, by Beziau, Jean-Yves | 2015 | Béziau Sigma-4 | 4 | Octagon |
| | Arguing from Molinism to Neo-Molinism, p. 332, by Hess, Elijah | 2015 | Classical Sigma-2 | 3 | Rectangle |
| | Arguing from Molinism to Neo-Molinism, p. 340, by Hess, Elijah | 2015 | Classical Sigma-2 | 3 | Rectangle |
| | Structures of Opposition in Fuzzy Rough Sets, p. 3, by Ciucci, Davide; Dubois, Didier; Prade, Henri | 2015 | Classical Sigma-2 | 3 | Rectangle |
| | Structures of Opposition in Fuzzy Rough Sets, p. 4, by Ciucci, Davide; Dubois, Didier; Prade, Henri | 2015 | Jacoby-Sesmat-Blanché Sigma-3 | 3 | Hexagon |
| | Structures of Opposition in Fuzzy Rough Sets, p. 5, by Ciucci, Davide; Dubois, Didier; Prade, Henri | 2015 | Keynes-Johnson Sigma-4 | 7 | Cube |
| | Structures of Opposition in Fuzzy Rough Sets, p. 5, by Ciucci, Davide; Dubois, Didier; Prade, Henri | 2015 | Sigma-4 Graph | | Cube |
| | Structures of Opposition in Fuzzy Rough Sets, p. 9, by Ciucci, Davide; Dubois, Didier; Prade, Henri | 2015 | Keynes-Johnson Sigma-4 | 7 | Cube |
| | Structures of Opposition in Fuzzy Rough Sets, p. 12, by Ciucci, Davide; Dubois, Didier; Prade, Henri | 2015 | Sigma-4 Graph | | Cube |
| | Structures of Opposition in Fuzzy Rough Sets, p. 13, by Ciucci, Davide; Dubois, Didier; Prade, Henri | 2015 | Sigma-4 Graph | | Cube |
| | Not Only Barbara, p. 98, by Dekker, Paul | 2015 | Classical Sigma-2 | 3 | Square |
| | Not Only Barbara, p. 99, by Dekker, Paul | 2015 | Classical Sigma-2 | 3 | Square |
| | Not Only Barbara, p. 100, by Dekker, Paul | 2015 | Moretti-Pellissier Sigma-4 | 5 | Cube |
| | Not Only Barbara, p. 101, by Dekker, Paul | 2015 | Moretti-Pellissier Sigma-4 | 5 | Cube |
| | Not Only Barbara, p. 122, by Dekker, Paul | 2015 | Jacoby-Sesmat-Blanché Sigma-3 | 4 | Triangular Prism |
| | Not Only Barbara, p. 123, by Dekker, Paul | 2015 | Degenerate Sigma-3 with Unconnectedness 4 | 5 | Triangular Prism |
| | Not Only Barbara, p. 124, by Dekker, Paul | 2015 | Non-Sigma | 4 | Tetrahedron |
| | Not Only Barbara, p. 125, by Dekker, Paul | 2015 | Non-Sigma | 5 | Tetrahedron |
| | Not Only Barbara, p. 126, by Dekker, Paul | 2015 | Moretti-Pellissier Sigma-4 | 4 | Cube |
| | Not Only Barbara, p. 126, by Dekker, Paul | 2015 | Non-Sigma | 4 | Tetrahedron |
| | Aristotle and Łukasiewicz on Existential Import, p. 537, by Read, Stephen | 2015 | Classical Sigma-2 | 3 | Rectangle |
| | Aristotle and Łukasiewicz on Existential Import, p. 538, by Read, Stephen | 2015 | Classical Sigma-2 | 3 | Rectangle |
| | Aristotle and Łukasiewicz on Existential Import, p. 540, by Read, Stephen | 2015 | Buridan Sigma-4 | 4 | Cube |
| | Introduction, p. 17, by Read, Stephen | 2015 | Classical Sigma-2 | 3 | Rectangle |