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USELESS - Article page with synonyms and phrases | Cambridge English Thesaurus
definition 2: not able to produce the desired or necessary effect; futile. His pleas were useless, as his attackers knew no mercy. All efforts to save the ship were useless in the raging storm. synonyms: bootless, fruitless, futile, idle, ineffective, ineffectual, inefficacious, vain. antonyms: helpful.
In this tutorial we define those symbols that do not participate in derivation of any string, i.e. the useless symbols, and remove the useless productions from the grammar. A symbol X is useful if: If X is generating, i.e., X => * w, where w ϵ L(G) and w in V t *, this means that the string leads to a string of terminal symbols.
USELESS - Synonyms, related words and examples | Cambridge English Thesaurus
the fact of not being useful; the fact of not doing or achieving what is needed or wanted. He was overwhelmed by feelings of uselessness.
USELESS - Article page with synonyms and phrases | Cambridge English Thesaurus
The proper word to use depends on the context. “Redundant” is the appropriate word when something is unnecessary because it is already being duplicated or has been stated before. On the other hand, “useless” refers to something that has no practical value or purpose. To provide a clearer understanding, let’s define each term.
