'Obvious factor' presentation slideshows

From the last time: gcd( a , b ) can be characterized in two different ways: It is the least positive value of ax

From the last time: gcd( a , b ) can be characterized in two different ways: It is the least positive value of ax + by where x and y range over integers. It is the positive common divisor of a and b which is divisible by every common divisor. .

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