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**DariushPetresku** · 03-14-2009, 08:14 PM

The first one (a + b = b) is also true, as there is a number out of the set of real numbers for which there is defined answer: a = b = 0. It's the part where both sides need to be divided by (a - b) that isn't permitted, as division by zero doesn't have a defined solution in real number algebra.

Yeah you're right, I was a little too fast.

Point is the OR statements are left out.

Same for the 2nd to last line, you're dividing by a. Either that's possible, or a = 0. That's what caused the mess.

03-14-2009, 08:14 PM	#16
DariushPetresku Join Date Oct 2005 Posts 437 Senior Member	The first one (a + b = b) is also true, as there is a number out of the set of real numbers for which there is defined answer: a = b = 0. It's the part where both sides need to be divided by (a - b) that isn't permitted, as division by zero doesn't have a defined solution in real number algebra. Yeah you're right, I was a little too fast. Point is the OR statements are left out. Same for the 2nd to last line, you're dividing by a. Either that's possible, or a = 0. That's what caused the mess.
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