Prove Inequality $(a,b,c\geq1)$

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In summary, inequality in mathematics is a relation between two values, indicating that one value is greater than, less than, or not equal to the other value. This can be represented using symbols such as <, >, ≤, ≥, or ≠. To prove an inequality, techniques such as induction, contradiction, and mathematical manipulation can be used. Proving inequalities is important because it allows us to establish relationships and make comparisons between values, and it is applicable in various mathematical fields. When proving inequalities, it is important to avoid common mistakes such as incorrect use of symbols and skipping steps in the proof. Inequalities can be proven using both mathematical and real-life examples, as the concepts can be applied to various situations.
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Albert1
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$given :\,\,$ $a,b,c\geq1$

$prove:$

$(1+a)(1+b)(1+c)\geq 2(1+a+b+c)$
 
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Here is my solution.

$$(1+a)(1+b)(1+c) = 1 + a + b + c + ab + bc + ca + abc $$

and since $a,b,c \ge 1$, then $ab + bc + ca \ge a + b + c $ and $abc \ge 1$; the result now follows.
 

FAQ: Prove Inequality $(a,b,c\geq1)$

What is the definition of inequality in mathematics?

In mathematics, inequality is a relation between two values, indicating that one value is greater than, less than, or not equal to the other value. This can be represented using symbols such as <, >, ≤, ≥, or ≠.

How can we prove an inequality using mathematical techniques?

To prove an inequality, we can use techniques such as induction, contradiction, and mathematical manipulation. We can also use known theorems and properties to simplify the inequality and make it easier to prove.

Why is it important to prove inequalities in mathematics?

Proving inequalities is important because it allows us to establish relationships between different values and make comparisons. It also helps us to solve problems and make predictions in various mathematical fields such as calculus, algebra, and geometry.

What are some common mistakes to avoid when proving inequalities?

Some common mistakes to avoid when proving inequalities include incorrect use of symbols, skipping steps in the proof, and making assumptions without proper justification. It is important to carefully follow the rules of mathematical logic and provide clear and logical explanations for each step in the proof.

Can inequalities be proven using real-life examples or only in mathematical contexts?

Inequalities can be proven using both mathematical and real-life examples. In mathematics, we use abstract symbols to represent numbers and relationships, but these concepts can also be applied to real-life situations. For example, we can use inequalities to compare the heights of different buildings or the prices of different products.

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