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  2. Modal verb - Wikipedia

    en.wikipedia.org/wiki/Modal_verb

    That can indeed hinder. You can, if you are allowed. She can really sing. could: That could happen soon. – He could swim when he was young. may: That may be a problem. May I stay? – might: The weather might improve. Might I help you? – must: It must be hot outside. Sam must go to school. – shall: This shall not be viewed kindly. You ...

  3. English modal auxiliary verbs - Wikipedia

    en.wikipedia.org/wiki/English_modal_auxiliary_verbs

    The English modal auxiliary verbs are a subset of the English auxiliary verbs used mostly to express modality, properties such as possibility and obligation. [a] They can most easily be distinguished from other verbs by their defectiveness (they do not have participles or plain forms [b]) and by their lack of the ending ‑(e)s for the third-person singular.

  4. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    While the first interpretation may be expected by some users due to the nature of implied multiplication, [38] the latter is more in line with the rule that multiplication and division are of equal precedence. [3] When the user is unsure how a calculator will interpret an expression, parentheses can be used to remove the ambiguity. [3]

  5. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    (the symbol may also indicate the domain and codomain of a function; see table of mathematical symbols). ⊃ {\displaystyle \supset } may mean the same as ⇒ {\displaystyle \Rightarrow } (the symbol may also mean superset ).

  6. Material implication (rule of inference) - Wikipedia

    en.wikipedia.org/wiki/Material_implication_(rule...

    In propositional logic, material implication [1] [2] is a valid rule of replacement that allows a conditional statement to be replaced by a disjunction in which the antecedent is negated. The rule states that P implies Q is logically equivalent to not-or and that either form can replace the other in logical proofs.

  7. Contraposition - Wikipedia

    en.wikipedia.org/wiki/Contraposition

    All that can be validly inferred is that "Some P are S". Thus, the type "A" proposition "All P is S" cannot be inferred by conversion from the original type "A" proposition "All S is P". All that can be inferred is the type "A" proposition "All non-P is non-S" (note that (P → Q) and (¬Q → ¬P) are both type "A" propositions). Grammatically ...

  8. Doctors Say This Nighttime Behavior Can Be A Sign Of Dementia

    www.aol.com/doctors-nighttime-behavior-sign...

    People also may not remember where their home is or the loved ones who take care of them, Dr. Kobylarz says. “You can see [the person with dementia] change at a certain time of the day and ...

  9. Word problem (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Word_problem_(mathematics)

    The word problem for free bounded lattices is the problem of determining which of these elements of W(X) denote the same element in the free bounded lattice FX, and hence in every bounded lattice. The word problem may be resolved as follows. A relation ≤ ~ on W(X) may be defined inductively by setting w ≤ ~ v if and only if one of the ...