must be logical

USAGE SUMMARY

The phrase "must be logical" is correct and usable in written English.
You can use it when emphasizing that something should follow a rational or reasonable line of thought. Example: "In order to solve this problem effectively, your arguments must be logical and well-structured."

✓ Grammatically correct

Science

News & Media

Encyclopedias

Wiki

Human-verified examples from authoritative sources

Exact Expressions

10 human-written examples

We might agree that there must be logical objects of some sort if logic is to have a subject matter, but if Frege is to achieve his goal of showing that our knowledge of arithmetic is free of intuition, then at some point he has to address the question of how, as a matter of meaning, existence claims can be analytic.

SEP

Progress must be logical.

The New York Times - Books

Clothes, she stated, must be logical.

Independent

If the state must nanny, the rules must be logical and simple.

The Guardian - Opinion

To be coherent, it must be logical, laying out a bulletproof argument.

Harvard Business Review

All of the axioms must be logical truths, and the rules of inference must preserve logical truth.

Britannica

Human-verified similar examples from authoritative sources

Similar Expressions

50 human-written examples

In order to be logically correct, the conclusion s of an argument <σ, s> must logically follow from σ, i.e., s must be a logical consequence of σ (WL II, 391 395; the similarity with the distinction between material and formal consequence in Tarski 1956, 419, is obvious).

SEP

Brand extensions must be a logical fit with consumer's expectations.

The Guardian

"(R1) The explanandum must be a logical consequence of the explanans.

Asia-Pacific Science Education

First, "the explanandum must be a logical consequence of the explanans" and "the sentences constituting the explanans must be true" (Hempel, 1965, p. 248).

SEP

An explanans appropriately explaining an explanandum need to meet four requirements: "(R1) The explanandum must be a logical consequence of the explanans.

Asia-Pacific Science Education

Expert writing Tips

Best practice

When constructing an argument, ensure your premises directly support your conclusion to maintain a "must be logical" flow. Avoid introducing irrelevant information that could weaken the argument's coherence.

Common error

Avoid making unsupported claims. Each step in your reasoning "must be logical" and backed by evidence. Otherwise, your argument will lack credibility and fail to persuade your audience.

Linguistic Context

The phrase "must be logical" functions as a modal verb phrase. It expresses a strong necessity or requirement for something to adhere to principles of logic and reason. Ludwig AI confirms that the phrase is correct and usable in written English, emphasizing the importance of rational thought.

Expression frequency: Uncommon

Frequent in

Science

30%

News & Media

20%

Encyclopedias

15%

Less common in

Wiki

15%

Academia

10%

Formal & Business

10%

Ludwig's WRAP-UP

In summary, the phrase "must be logical" is a grammatically sound expression used to emphasize the necessity of rational and coherent reasoning. Ludwig AI indicates its correctness and usability. While not extremely common, it appears across various contexts, particularly in science, news, and encyclopedic sources. To enhance clarity and impact, consider related phrases like "has to be rational" or "needs to be coherent". Ensure each step of your argument is supported by evidence to prevent logical fallacies. Use "must be logical" when you want to underscore the critical importance of sound reasoning.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

has to be rational

Replaces "must" with "has to", emphasizing obligation and "logical" with "rational" with a nuance on reason

needs to be coherent

Substitutes "must" with "needs to" and "logical" with "coherent", focusing on clarity and consistency.

should be reasonable

Replaces "must" with "should" to soften the obligation, and "logical" with "reasonable" to suggest fairness and practicality.

is required to be rational

Emphasizes the necessity of being rational using a more formal tone.

it is essential to be logical

Highlights the essential nature of logical thinking in a situation.

demands a logical approach

Focuses on the approach or method needing to be logical.

requires a coherent framework

Emphasizes the need for an overall consistent structure.

necessitates rational thought

Highlights the necessity of rational thought.

a sound argument is needed

Focuses on the need for a valid and well-reasoned argument.

rationality is paramount

Emphasizes rationality as the most important aspect.

FAQs

How can I effectively use "must be logical" in a sentence?

Use "must be logical" to emphasize the need for rational and coherent reasoning in a given context. For example: "In scientific experiments, the methodology "must be logical" and replicable to ensure valid results."

What are some alternatives to saying "must be logical"?

You can use alternatives such as "should be reasonable", "needs to be coherent", or "has to be rational", depending on the specific nuance you want to convey.

In what contexts is it most appropriate to use the phrase "must be logical"?

The phrase "must be logical" is particularly appropriate in contexts where clear and rational thinking is essential, such as in scientific research, legal arguments, or business strategies. It emphasizes the necessity for a sound and well-reasoned approach.

Is there a difference between saying something "must be logical" and saying it "should be logical"?

Yes, "must be logical" implies a stronger requirement for rationality and coherence than "should be logical". "Must" indicates necessity, while "should" suggests a recommendation or preference. Therefore, "must be logical" is used when there is a critical need for sound reasoning.