Abstract
Motivated by the structure of conformal anomalies in two-dimensional gravity and its generalizations, the projective and conformal covariance properties of linear, bilinear and trilinear differential operators are investigated in some detail and the triviality of the covariant trilinear operators is demonstrated.
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Garajeu, D. Conformally and Projective Covariant Differential Operators. Letters in Mathematical Physics 47, 293–306 (1999). https://doi.org/10.1023/A:1007505930234
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DOI: https://doi.org/10.1023/A:1007505930234