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
this is a proof
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "this is a proof" is grammatically correct and can be used in written English.
It is typically used to indicate that something is evidence or validation of a statement or claim. Example: "This is a proof that my theory was correct all along. The data supports my hypothesis."
✓ Grammatically correct
Science
News & Media
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
41 human-written examples
This is a proof of principle study".
News & Media
"This is a proof of concept," Dr. Siliciano said.
News & Media
However this is a proof of concept that pluripotency can be achieved in vivo".
News & Media
This is a proof of what he has endured for Cindy, and how these wounds solemnise their love.
News & Media
"This is a proof that the political basis of the regime is collapsing," said Samir Nachar, a leader of the Syrian National Council, the main exile opposition group.
News & Media
"This is a proof that economic exchanges and cooperation will lead to building up trust in military affairs as well," Jeong Se Hyun, South Korea's unification minister, told reporters on Saturday on returning here from Pyongyang.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
19 human-written examples
Professor Ioannis Ieropoulos, director of the Bristol BioEnergy Centre, added: "This is a proof-of-concept robot, which follows the EcoBot line of work that is developing autonomous robots capable of generating their energy from the environment they operate in.
News & Media
It should also been pointed out that this is a proof-of-concept article.
Science
"This is a proof-of-concept study, the first to show that a vaccine can be effective against noroviruses," Atmar says.
Science & Research
In conclusion, this is a proof-of-concept study demonstrating that ESFTT could be a potentially new approach for tendon repair and regeneration.
Science
This is a proof-of-concept prototype, implementing the minimum functionalities required for the customer of a VoIP service to specify the required quality level and for the NSP to reach the CoS that meets the customer requirements.
Expert writing Tips
Best practice
When using "this is a proof", clearly state what 'this' refers to. Ensure that the connection between the evidence and the claim is explicit to avoid ambiguity.
Common error
Avoid using "this is a proof" when the evidence is circumstantial or not conclusive. Instead, use softer terms like "suggests" or "indicates" to avoid overstating the strength of your argument.
Source & Trust
86%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "this is a proof" functions as a declarative statement that introduces evidence or a reason supporting a particular argument or claim. As Ludwig AI confirms, it asserts the validity of something based on presented information.
Frequent in
Science
40%
News & Media
40%
Formal & Business
20%
Less common in
Social Media
0%
Reference
0%
Encyclopedias
0%
Ludwig's WRAP-UP
In summary, "this is a proof" is a phrase used to introduce evidence or reasoning that supports a claim. Ludwig AI validates its grammatical correctness and notes its primary function in persuasive communication. Although relatively uncommon, this phrase appears across various contexts like Science, News and Media, and Formal Writing, maintaining a neutral register. To use it effectively, ensure a clear connection between the evidence and the claim and avoid overstating the conclusiveness of the evidence. Consider alternatives like "this demonstrates" or "this confirms" for nuanced expressions. By following the best practices and avoiding common mistakes, you can confidently employ "this is a proof" in your writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
this demonstrates
Focuses on the act of showing or illustrating something, rather than a formal demonstration.
this confirms
Highlights the act of verifying or establishing the truth of something.
this validates
Emphasizes the act of confirming the accuracy or legitimacy of something.
this substantiates
Stresses the provision of support or evidence for a claim.
this is evidence of
Directly states that something serves as proof.
this bears witness to
Implies a more testimonial or observational type of proof.
this attests to
Highlights the act of formally affirming or declaring something to be true.
this supports the idea that
Expresses the idea that something lends credence to a particular concept.
this underpins the claim that
Suggests that something forms the basis for a particular assertion.
the following shows that
Emphasizes the act of presenting something that demonstrates a particular point.
FAQs
How can I use "this is a proof" in a sentence?
Use "this is a proof" to introduce factual evidence or logical arguments that support a particular claim. For example, "The statistically significant results from the study, /s/this+is+a+proof, demonstrate the efficacy of the new drug".
What are some alternatives to "this is a proof"?
Alternatives include "this demonstrates", "this confirms", or "this validates". The best choice depends on the specific context and the nuance you wish to convey.
Is it always appropriate to say "this is a proof"?
No, ensure that the evidence you are presenting genuinely constitutes proof. If there is room for doubt or alternative explanations, consider using weaker language such as "this suggests" or "this indicates".
What's the difference between "this is a proof" and "this is evidence"?
"This is a proof" implies a conclusive demonstration, whereas "this is evidence" suggests that something supports a claim but may not definitively prove it. Proof is a higher standard than evidence.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
86%
Authority and reliability
4.1/5
Expert rating
Real-world application tested