Because eTBLAST is a text-similarity engine rather than a simple keyword-based search tool, it is claimed that the user need not identify and manipulate query keywords and Boolean operators, as must be done for other search engines.
32.
In order to directly represent operations which are common in hardware, there are many features of VHDL which are not found in Ada, such as an extended set of Boolean operators including "'nand "'and "'nor " '.
33.
Can I, or how can I, search for articles with Boolean operators, such as AND and OR . For example, suppose I want to retrieve an article I remember reading two weeks ago that had the words Lewandowski and Schubert in it.
34.
Now, anyone who has used a search engine knows that phrasing a successful query is something of a black art, involving carefully chosen keywords, odd punctuation and Boolean operators in just the right places _ in other words, nothing like those in the ads.
35.
The exclusive-or explicitly states " one or the other, but not neither nor both . " However, the mapping correspondence between formal Boolean operators and natural language conjunctions is far from simple or one-to-one, and has been studied for decades in linguistics and analytic philosophy.
36.
PubMed translates this initial search formulation and automatically adds field names, relevant MeSH ( Medical Subject Headings ) terms, synonyms, Boolean operators, and'nests'the resulting terms appropriately, enhancing the search formulation significantly, in particular by routinely combining ( using the OR operator ) textwords and MeSH terms.
37.
The database may be searched by author name or textword using the basic search screen or, if the advanced search screen is used, by author name, author ORCID ID number, textword ( with wildcard characters and truncation ), hybrid textword + synonyms, or journal using Boolean operators.
38.
Out of the 256 ternary boolean operators cited above, \ binom { 3 } { 2 } \ cdot 16-\ binom { 3 } { 1 } \ cdot 4 + \ binom { 3 } { 0 } \ cdot 2 of them are such degenerate forms of binary or lower-arity operators, using the inclusion-exclusion principle.
