On 5/8/2017 10:40 AM, Jon Awbrey wrote:
The question then is whether we keep or lose information in passing from a triadic relation to the collection of its dyadic projections.
Linguists use the term 'obligatory'. For example: Obligatory: "Mary gave Bill a camera." Optional: "Mary saw Bill with a camera at the party." In the first sentence 'gave' has three obligatory participants. If you omit one, its absence can be noticed or inferred: "Everyone gave Bill a present for his birthday. Mary gave a camera." In the second sentence, 'saw' has an obligatory object, but "with a camera" and "at the party" are optional adjuncts. John
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