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Aprende Vagueness and Degrees of Truth | From Crisp Logic to Fuzzy Thinking
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Fuzzy Logic and Approximate Reasoning

bookVagueness and Degrees of Truth

Vagueness is a common feature of natural language and real-world situations. It refers to concepts that do not have sharp boundaries, making it hard to assign them a precise definition. Words such as "tall", "warm", or "old" are inherently vague because there is no universal agreement on where the boundary lies. For instance, at what exact height does a person become "tall"? In classical, or binary, logic — also called crisp logic — each object either fully belongs to a set or it does not. This means a person is either "tall" or "not tall", with no room for uncertainty or gradation. This rigid approach struggles to handle the nuance and gradation present in concepts like "tall" or "warm", which are not black and white in everyday reasoning.

Fuzzy logic introduces the idea of degrees of truth to address this limitation. Instead of forcing every statement to be either entirely true or entirely false, fuzzy logic allows for partial membership in a set. This means that an object can belong to a category to some extent, with a value anywhere between 0 (completely false) and 1 (completely true). In contrast, binary membership only allows values of 0 or 1. For example, a person who is 5'10" might be considered "tall" to a degree of 0.7, reflecting that they are somewhat tall but not extremely so. This approach more closely matches how people interpret vague terms in daily life.

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import numpy as np # Heights in centimeters heights = np.array([160, 170, 180, 190, 200]) # Degrees of "tallness" for each height (values between 0 and 1) tallness_scores = np.array([0.1, 0.4, 0.7, 0.9, 1.0]) for h, score in zip(heights, tallness_scores): print(f"Height: {h} cm, Degree of 'tall': {score}")
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Which statement best describes the concept of degrees of truth in fuzzy logic?

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Sección 1. Capítulo 2

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bookVagueness and Degrees of Truth

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Vagueness is a common feature of natural language and real-world situations. It refers to concepts that do not have sharp boundaries, making it hard to assign them a precise definition. Words such as "tall", "warm", or "old" are inherently vague because there is no universal agreement on where the boundary lies. For instance, at what exact height does a person become "tall"? In classical, or binary, logic — also called crisp logic — each object either fully belongs to a set or it does not. This means a person is either "tall" or "not tall", with no room for uncertainty or gradation. This rigid approach struggles to handle the nuance and gradation present in concepts like "tall" or "warm", which are not black and white in everyday reasoning.

Fuzzy logic introduces the idea of degrees of truth to address this limitation. Instead of forcing every statement to be either entirely true or entirely false, fuzzy logic allows for partial membership in a set. This means that an object can belong to a category to some extent, with a value anywhere between 0 (completely false) and 1 (completely true). In contrast, binary membership only allows values of 0 or 1. For example, a person who is 5'10" might be considered "tall" to a degree of 0.7, reflecting that they are somewhat tall but not extremely so. This approach more closely matches how people interpret vague terms in daily life.

12345678910
import numpy as np # Heights in centimeters heights = np.array([160, 170, 180, 190, 200]) # Degrees of "tallness" for each height (values between 0 and 1) tallness_scores = np.array([0.1, 0.4, 0.7, 0.9, 1.0]) for h, score in zip(heights, tallness_scores): print(f"Height: {h} cm, Degree of 'tall': {score}")
copy
question mark

Which statement best describes the concept of degrees of truth in fuzzy logic?

Select the correct answer

¿Todo estuvo claro?

¿Cómo podemos mejorarlo?

¡Gracias por tus comentarios!

Sección 1. Capítulo 2
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