L

• “L'« — » + L''* — » + L*'* — 3 («_ i) + K X N''* muft be taken”

  Internet Archive: Mathematical memoirs respecting a variety of subjects;

• “A language L is open if it can be extended to a new language L² without changes in the meanings of other expressions; otherwise”

  Lvov-Warsaw School

• “But the first-order language L is certainly not reducible to the language L² of syllogisms, since in L we can write down a sentence saying that exactly three elements satisfy”

  Model Theory

• “Given two languages L and L², we can compare them by asking whether every class Mod (S), with S a sentence of L, is also a class of the form Mod (S²) where S² is a sentence of L².”

  Model Theory

• “If the answer is Yes, we say that L is reducible to L², or that L² is at least as expressive as L.”

  Model Theory

• “Recall that a translation from a logic L into a logic L² is a mapping f between the respective sets of formulas which preserves derivability, that is:”

  Combining Logics

• “We could repeat the recursion clauses for L to produce a full theory of truth for L².”

  Truth

• “Then for every predicate E (x) of expressions of L defined in L+ one can prove in L+ a general sentence of the form”

  Alfred Tarski

• “He still did not look at Melody until she reached out and took him hand in hers. 1 __ a l l - L _ L-- L”

  A different flesh

• “In S and S′ are lamps L, L′ and experimenters E, E′ as indicated.”

  RELATIVITY

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