# Unifier

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### Dictionary Meaning and Definition on 'Unifier'

Unifier Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
Unifier \U"ni*fi`er\, n. One who, or that which, unifies; as, a natural law is a unifier of phenomena.
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### Wikipedia Meaning and Definition on 'Unifier'

In logic, a rule of inference is admissible in a formal system if the set of theorems of the system does not change when that rule is added to the existing rules of the system. In other words, every formula that can be derived using that rule is already derivable without that rule, so, in a sense, it is redundant. The concept of an admissible rule was introduced by Paul Lorenzen (1955).

Admissibility has been systematically studied only in the case of structural rules in propositional non-classical logics, which we will describe next.

Let a set of basic propositional connectives be fixed (for instance, in the case of superintuitionistic logics, or in the case of monomodal logics). Well-formed formulas are built freely using these connectives from a countably infinite set of propositional variables pn. A substitution σ is a function from formulas to formulas which commutes with the connectives, i.e.,

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### Unifier Sample Sentences in News

• Railways integrator, unifier of India, says president
New Delhi, April 22 (IANS) Millions of Indians from various backgrounds use one common mode of transportation - the Indian Railways - which thus play a major role as an "integrator and unifier" of the country, President Pranab Mukherjee said Tuesday. "They (the people) lose their individual identities and assume one common identity as passengers of Read more on this news related to 'Unifier'
• Railways a unifier of India: President
New Delhi, Apr 22 (PTI) President Pranab Mukherjee today called the Indian Railways an "integrator and unifier" of the country. Read more on this news related to 'Unifier'
• FW de Klerk: world has lost a great unifier with Nelson Mandela's death
South African president who freed Nelson Mandela, shared Nobel prize with him and joined him in first post-apartheid government, says 'he lived reconciliation and was never bitter' FW de Klerk, the South African president under whom Nelson Mandela was released from prison, has said his country and the world have lost "a great unifier". De Klerk s Read more on this news related to 'Unifier'