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  2. SQ3R - Wikipedia

    en.wikipedia.org/wiki/SQ3R

    SQRRR or SQ3R is a reading comprehension method named for its five steps: survey, question, read, recite, and review. The method was introduced by Francis P. Robinson in his 1941 book Effective Study .

  3. List of logic symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_logic_symbols

    definition: is defined as metalanguage:= means "from now on, is defined to be another name for ." This is a statement in the metalanguage, not the object language. The notation may occasionally be seen in physics, meaning the same as :=.

  4. Bottom type - Wikipedia

    en.wikipedia.org/wiki/Bottom_type

    It is dual to the top type, which spans all possible values in a system. If a type system is sound, the bottom type is uninhabited and a term of bottom type represents a logical contradiction. In such systems, typically no distinction is drawn between the bottom type and the empty type, and the terms may be used interchangeably.

  5. Science Research Associates - Wikipedia

    en.wikipedia.org/wiki/Science_Research_Associates

    Science Research Associates Inc. was founded in 1938 [1] with a trade and occupational focus. In 1957, it moved into individualized classroom instruction with the iconic SRA Reading Laboratory Kit, a format that they translated to mathematics, science, and social studies [1] commonly called SRA cards. [2]

  6. Initial and terminal objects - Wikipedia

    en.wikipedia.org/wiki/Initial_and_terminal_objects

    The empty set is the unique initial object in Set, the category of sets.Every one-element set is a terminal object in this category; there are no zero objects.. Similarly, the empty space is the unique initial object in Top, the category of topological spaces and every one-point space is a terminal object in thi

  7. Talk:SQ3R - Wikipedia

    en.wikipedia.org/wiki/Talk:SQ3R

    Whereas in Effective Study, he suggests to do this for each passage. So Survey whole chapter, then on first passage Question, Read, Recite, repeat for each passage, then Review at end of chapter. I think we should stick to the original Effective Study SQ3R and possibly mention the variations.

  8. Axiom of empty set - Wikipedia

    en.wikipedia.org/wiki/Axiom_of_empty_set

    We can use the axiom of extensionality to show that there is only one empty set. Since it is unique we can name it. It is called the empty set (denoted by { } or ∅). The axiom, stated in natural language, is in essence: An empty set exists. This formula is a theorem and considered true in every version of set theory.

  9. Information retrieval - Wikipedia

    en.wikipedia.org/wiki/Information_retrieval

    In information retrieval, a query does not uniquely identify a single object in the collection. Instead, several objects may match the query, perhaps with different degrees of relevance. An object is an entity that is represented by information in a content collection or database. User queries are matched against the database information.