# Well-Formed Formula

A Well-Formed Formula is a valid logic sentence that is a syntactically correct sentence.

## References

### 2013

- (Wikipedia, 2009) ⇒ http://en.wikipedia.org/wiki/Well-formed_formula
- In mathematical logic, a
**well-formed formula**, shortly wff, often simply**formula**, is a word (i.e. a finite sequence of symbols from a given alphabet) which is part of a formal language.^{[1]}A formal language can be considered to be identical to the set containing all and only its formulas.A formula is a syntactic formal object that can be informally given a semantic meaning.

- In mathematical logic, a

### 2009

- http://en.wiktionary.org/wiki/well-formed_formula
- A statement that is expressed in a valid, syntactically correct, manner

- http://www.coli.uni-saarland.de/projects/milca/courses/comsem/xhtml/d0e1-gloss.xhtml
- FOL: formulae that are built from a vocabulary, the logical symbols of FOL and first-order variables according to the syntax rules of FOL.

- CYC Glossary http://www.cyc.com/cycdoc/ref/glossary.html