What are the steps to prove these statements? I would love clarification on how to approach these problems. - If x0, then xzyz (for some x,y,z ∈ Z where z is set of integers)

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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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What are the steps to prove these statements? I would love clarification on how to approach these problems.

- If x<y and y<z then x<z.

- if x<y and z>0, then xz<yz

- if z<0 and x<y then xz>yz

(for some x,y,z ∈ Z where z is set of integers)

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We have to prove the given statement.

 

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