Proof
If (odd) divides , then since ,
by VII.24.
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Depends on (3)
- VII.24Proposition VII.24If two numbers be prime to any number, their product also will be prime to the same.
- VII.6Definition VII.6An even number is that which is divisible into two equal parts.
- VII.7Definition VII.7An odd number is that which is not divisible into two equal parts, or that which differs by a unit from an even number.
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