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  2. Substitution (sport) - Wikipedia

    en.wikipedia.org/wiki/Substitution_(sport)

    Free substitution or rolling substitution is a rule in some sports that allows players to enter and leave the game for other players many times during the course of a game, generally during a time-out or other break in live play; and for coaches to bring in and take out players an unlimited number of times.

  3. Substitute (association football) - Wikipedia

    en.wikipedia.org/wiki/Substitute_(association...

    The assistant referee indicating a substitution Fourth official notifying the referee of the details of the substitution. Substitutions are governed under Law 3 of the Laws of the Game in the (3) Substitution Procedure section. [21] A player can only be substituted during a stoppage in play and with the permission of the referee. The player to ...

  4. Substitution table - Wikipedia

    en.wikipedia.org/wiki/Substitution_table

    A substitution table is used while teaching structures of English. [1] [2] Substitution tables were invented by Harold E. Palmer, [3] who defines substitution as "the process by which any authentic sentence may be multiplied indefinitely by substituting for any of its words or word-groups others of the same grammatical family and within certain semantic limits".

  5. Two-platoon system - Wikipedia

    en.wikipedia.org/wiki/Two-platoon_system

    The change would be sudden. The January 1953 convention of the NCAA's rules committee, acting at the behest of a resolution drafted by the NCAA Council to the gathering, [4] voted to eliminate free substitution and thus the two-platoon system from the college game, effective with the forthcoming 1953 season. [5]

  6. List of reagents - Wikipedia

    en.wikipedia.org/wiki/List_of_reagents

    used in radical substitution and electrophilic addition reactions in organic chemistry. Also acts as a mild oxidizer to oxidize benzylic or allylic alcohols. Butanone (methyl ethyl ketone) organic compound; similar solvent properties to acetone but has a significantly slower evaporation rate Butylated hydroxytoluene

  7. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    These identities are useful whenever expressions involving trigonometric functions need to be simplified. An important application is the integration of non-trigonometric functions: a common technique involves first using the substitution rule with a trigonometric function, and then simplifying the resulting integral with a trigonometric identity.