Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
are not introduced
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "are not introduced" is correct and usable in written English.
It can be used when discussing subjects or topics that have not been presented or brought forward in a conversation or text. Example: "In this report, several key concepts are not introduced until the final section, which may confuse the reader."
✓ Grammatically correct
Science
News & Media
Alternative expressions(20)
are not incorporated
are left out
are not part of
are not criminalized
are not presented
are not depicted
are omitted
are not implemented
are not attached
are missing
are absent from
are not concerned
are excluded
are not incurred
are not mentioned
are not included
are not inserted
are not recalled
are not characterised
are no included
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
60 human-written examples
The players are not introduced until the closing credits.
News & Media
Students are not introduced to the possibilities of music as an expressive language.
News & Media
Rummenigge says a split cannot be ruled out if changes are not introduced.
News & Media
As Greenlees of the Crafts Council points out, if primary and secondary schoolchildren are not introduced to craft, they won't be aware they can do those jobs, leading higher-education courses to close.
News & Media
Adding to the intrigue, most of the film's interviewees are not introduced, and it is left for the viewer to figure out who they are and to try to piece together a timeline.
News & Media
Don is still packing a hip flask, telling stories from his youth as Dick Whitman (something he's never done socially) and hanging around with women to whom we are not introduced – the suggestion being that if the audience barely knows them, then neither does he.
News & Media
That model can then be compared with a similar model derived from a modified version of the program, to check that they match and to ensure that new bugs are not introduced as the program is updated and new features are added.
News & Media
Often undergraduate chemical science students are not introduced to nontraditional science-related careers.
Science & Research
On the theoretical basis, rules for base isolation and National Annexes are not introduced.
The procedural blanks confirm sterols are not introduced during laboratory work up procedures.
Science
Hence, periodic quantization artifacts are not introduced in the secondary dequantized DCT coefficients [13].
Expert writing Tips
Best practice
When using "are not introduced", ensure the context clearly specifies what is lacking introduction to avoid ambiguity. For example, "The new safety protocols are not introduced in this version of the software" provides clarity.
Common error
Avoid stringing multiple clauses together where "are not introduced" appears, as this can lead to convoluted sentences. Break down complex ideas into smaller, more digestible statements for better clarity. For example, instead of saying "Because the variables are not properly defined and the assumptions are not introduced, the model fails", it's clearer to say "The variables are not properly defined. The assumptions are not introduced. Consequently, the model fails."
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "are not introduced" functions as a passive voice construction, indicating that a subject or topic has not been presented, implemented, or brought into discussion. Ludwig provides various examples demonstrating this function across different contexts.
Frequent in
Science
65%
News & Media
28%
Formal & Business
7%
Less common in
Wiki
1%
Encyclopedias
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, "are not introduced" is a grammatically correct and versatile phrase used to indicate the absence of presentation, implementation, or inclusion. As confirmed by Ludwig, it is particularly common in scientific and news contexts, serving to inform the audience about what has been omitted or remains to be unveiled. When using this phrase, ensure clarity by specifying what lacks introduction, and avoid overuse in overly complex sentences for better readability. Consider using alternatives such as "have not been presented" or "are not included" depending on the specific nuance you wish to convey. The high frequency and broad applicability of "are not introduced" make it a valuable tool in effective communication.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
have not been presented
Focuses on the lack of presentation of something.
are not presented
Emphasizes the absence of a formal presentation.
are not implemented
Highlights the absence of practical application.
are not included
Focuses on the exclusion of something from a set.
are not mentioned
Emphasizes that something isn't verbally or textually noted.
are not brought up
Indicates a topic or subject wasn't raised.
are not featured
Highlights the absence of a prominent display or inclusion.
are not discussed
Focuses on the absence of conversation or debate.
are not established
Emphasizes that something is not yet set up or confirmed.
are not unveiled
Highlights the absence of a public announcement or reveal.
FAQs
How can I use "are not introduced" in a sentence?
Use "are not introduced" to indicate that certain elements, topics, or features haven't been presented or included. For example, "The advanced features "are not introduced" in the basic version of the software."
What's a formal alternative to "are not introduced"?
In formal contexts, consider using phrases like "have not been presented" or "are not included". These alternatives maintain a professional tone while conveying a similar meaning. Example: "These concepts "are not included" in this document."
Is there a difference between "are not introduced" and "are not mentioned"?
"Are not introduced" typically implies a planned absence of presentation or implementation, while "are not mentioned" simply means something wasn't referred to. The first highlights a deliberate omission, while the second highlights a lack of reference.
What can I say instead of "are not introduced" in academic writing?
In academic writing, you can use more formal alternatives such as "have not been presented", "are not discussed", or "are not addressed" to maintain a scholarly tone.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested