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Where ψ and φ represent formulas of propositional logic, ψ is a substitution instance of φ if and only if ψ may be obtained from φ by substituting formulas for propositional variables in φ, replacing each occurrence of the same variable by an occurrence of the same formula.
In logic, a rule of replacement [1] [2] [3] is a transformation rule that may be applied to only a particular segment of an expression. A logical system may be constructed so that it uses either axioms, rules of inference, or both as transformation rules for logical expressions in the system. Whereas a rule of inference is always applied to a ...
In microeconomics, substitute goods are two goods that can be used for the same purpose by consumers. [1] That is, a consumer perceives both goods as similar or comparable, so that having more of one good causes the consumer to desire less of the other good.
Lester Holt's replacement at "NBC Nightly News" has been revealed.. Tom Llamas will succeed Holt as anchor and managing editor of the nightly news broadcast, NBC News announced on Wednesday.
Amino acid replacement is a change from one amino acid to a different amino acid in a protein due to point mutation in the corresponding DNA sequence. It is caused by nonsynonymous missense mutation which changes the codon sequence to code other amino acid instead of the original.
NBC has chosen Tom Llamas to replace Lester Holt as the lead anchor and managing editor of NBC Nightly News, the network announced on Wednesday, March 5. Llamas, 45, is currently a senior national ...
A substitute check (also called an Image Replacement Document or IRD) [1] is a negotiable instrument that is a digital reproduction of an original paper check.As a negotiable payment instrument in the United States, a substitute check maintains the status of a "legal check" in lieu of the original paper check.
Gov. Ron DeSantis is holding a news conference Thursday morning where he named a replacement for Sen. Marco Rubio (R-Fla.), who was tapped by President-elect Trump to lead the State Department.