Proving lcm(m,n)=k using mZ and nZ intersection

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In summary, "Proving lcm(m,n)=k using mZ and nZ intersection" is a mathematical method of proving the least common multiple of two numbers m and n is equal to a given number k. This method involves finding the intersection of the multiples of m and n and identifying the smallest common multiple. It is a more efficient way of finding the lcm compared to other methods. This method can also be extended to prove the lcm of more than two numbers. Examples of using this method include proving lcm(4,6)=12 and lcm(3,8)=24.
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betty2301
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Homework Statement


prove:[itex]mZ\cap nZ=kZ[/itex]
where lcm(m,n)=k

Homework Equations


The Attempt at a Solution


i can prove that kZ is a subset of mZ and nZ but i cannot prove further!
thx for ur help!
 
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If x in mZ and nZ, x = am = bn for some integers a and b. So x is a common multiple of m and n. What is the relationship of x to k?
 

FAQ: Proving lcm(m,n)=k using mZ and nZ intersection

What is lcm(m,n)?

Lcm(m,n) stands for the lowest common multiple of two integers, m and n. It is the smallest positive integer that is divisible by both m and n.

How can mZ and nZ intersection be used to prove lcm(m,n)=k?

mZ and nZ intersection can be used to prove lcm(m,n)=k by showing that the smallest positive integer that is in both mZ and nZ is equal to lcm(m,n). This is because the smallest positive integer that is in both sets will be divisible by both m and n, making it the lowest common multiple.

What does k represent in the equation lcm(m,n)=k?

K represents the lowest common multiple of m and n. It is the smallest positive integer that is divisible by both m and n.

Can lcm(m,n) be proven using other methods besides mZ and nZ intersection?

Yes, there are other methods for proving lcm(m,n)=k, such as using prime factorization or the Euclidean algorithm.

Why is it important to prove lcm(m,n)=k?

Proving lcm(m,n)=k is important because it helps us understand the relationship between two integers and can be used in various mathematical calculations, such as finding the least common denominator in fractions.

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