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R2 is special, because the definition requires that "whenever xRy and yRz exist, there is xRz", and there is only one ordinal pair here, so it cannot be judged by definition. You can use r here. R (compound operation of relation r). If r. R is a subset of r, then r is transitive, otherwise it is not transitive. Here it is, R2. R2 is an empty set and a subset of R2, so it is transitive.