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No, a square matrix A is not invertible if its determinant |A| is equal to 0. A matrix is invertible (also known as non-singular or non-degenerate) if and only if its determinant is non-zero. If the determinant is zero, the matrix is singular and does not have an inverse.

Invertibility requires that the matrix represents a transformation that can be "undone." When the determinant is zero, it means the matrix collapses space (or at least reduces its dimension), making it impossible to reverse the transformation uniquely.

You can explore more about invertible matrices and their properties on websites such as:

• MathWorld: Invertible Matrix
• Wikipedia: Invertible Matrix

Fats, also known as lipids, serve several critical functions in the body:

• Energy Storage: Fats are the primary way the body stores energy. They are a concentrated source of energy, providing more than twice the energy per gram compared to carbohydrates or proteins.
• Insulation and Protection: Fat helps insulate the body, maintaining core body temperature. It also cushions and protects vital organs.
• Hormone Production: Fats are essential for producing hormones, including steroid hormones like estrogen and testosterone, which regulate various bodily functions.
• Cell Structure: Fats are a key component of cell membranes, providing structure and flexibility.
• Nutrient Absorption: Certain vitamins (A, D, E, and K) are fat-soluble, meaning they require fat to be properly absorbed by the body.
• Brain Function: Fats, especially omega-3 fatty acids, are crucial for brain development and function.

For more detailed information, you can refer to these resources:

• Harvard T.H. Chan School of Public Health - Fats and Cholesterol
• National Center for Biotechnology Information (NCBI) - Lipids

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Facebook is a popular social networking service and website launched in February 2004.

It allows users to:

• Create a profile with personal information
• Connect and communicate with friends, family, and colleagues
• Share photos, videos, and updates
• Join groups and communities based on interests
• Follow brands, businesses, and public figures
• Engage in discussions and express opinions

Facebook is accessible via web browsers and mobile apps on various devices and has become a significant platform for social interaction, news dissemination, and marketing.

As of 2023, Facebook is owned by Meta Platforms.

Source: About Facebook News