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  2. Implied-in-fact contract - Wikipedia

    en.wikipedia.org/wiki/Implied-in-fact_contract

    An implied-in-fact contract is a form of an implied contract formed by non-verbal conduct, rather than by explicit words. The United States Supreme Court has defined "an agreement 'implied in fact'" as "founded upon a meeting of minds, which, although not embodied in an express contract, is inferred, as a fact, from conduct of the parties showing, in the light of the surrounding circumstances ...

  3. Extraordinary assumptions and hypothetical conditions

    en.wikipedia.org/wiki/Extraordinary_assumptions...

    The distinction between extraordinary assumptions and hypothetical conditions can be a matter of law or professional standards in the field of real estate appraisal in the United States where the distinction is not only codified in USPAP, but enforced by various state real estate appraiser commissions or professional boards. However, the ...

  4. Logical consequence - Wikipedia

    en.wikipedia.org/wiki/Logical_consequence

    Syntactic accounts of logical consequence rely on schemes using inference rules. For instance, we can express the logical form of a valid argument as: All X are Y All Y are Z Therefore, all X are Z. This argument is formally valid, because every instance of arguments constructed using this scheme is valid.

  5. Inference - Wikipedia

    en.wikipedia.org/wiki/Inference

    Inferences are steps in logical reasoning, moving from premises to logical consequences; etymologically, the word infer means to "carry forward". Inference is theoretically traditionally divided into deduction and induction , a distinction that in Europe dates at least to Aristotle (300s BCE).

  6. Correlation does not imply causation - Wikipedia

    en.wikipedia.org/wiki/Correlation_does_not_imply...

    Correlations must first be confirmed as real, and every possible causative relationship must then be systematically explored. In the end, correlation alone cannot be used as evidence for a cause-and-effect relationship between a treatment and benefit, a risk factor and a disease, or a social or economic factor and various outcomes.

  7. BP Refinery (Westernport) Pty Ltd v Shire of Hastings

    en.wikipedia.org/wiki/BP_Refinery_(Westernport...

    An appeal against the assessment by BP to the County Court was dismissed, as was an appeal to the Supreme Court of Victoria.The Supreme Court held that under the Local Government Act the Shire of Hastings could only validly make an agreement with a particular ratepayer for specified land, and not any person who might subsequently become the ratepayer.

  8. Necessity and sufficiency - Wikipedia

    en.wikipedia.org/wiki/Necessity_and_sufficiency

    In logic and mathematics, necessity and sufficiency are terms used to describe a conditional or implicational relationship between two statements.For example, in the conditional statement: "If P then Q", Q is necessary for P, because the truth of Q is guaranteed by the truth of P.

  9. Modus ponens - Wikipedia

    en.wikipedia.org/wiki/Modus_ponens

    Enderton, for example, observes that "modus ponens can produce shorter formulas from longer ones", [9] and Russell observes that "the process of the inference cannot be reduced to symbols. Its sole record is the occurrence of ⊦q [the consequent] ... an inference is the dropping of a true premise; it is the dissolution of an implication". [10]