# Suppose that a and b belong to a commutative ring and ab is a zero-divisor. Show that either a or b is a zero-divisor.

Suppose that a and b belong to a commutative ring and ab is a zero-divisor. Show that either a or b is a zero-divisor.
You can still ask an expert for help

• Live experts 24/7
• Questions are typically answered in as fast as 30 minutes
• Personalized clear answers

Solve your problem for the price of one coffee

• Math expert for every subject
• Pay only if we can solve it

Delorenzoz
Let R be a commutative ring. it is known that for ab to be a zero divisor of a ring, it means that, (ab)x=0 for some x in the ring R such that $x\ne 0$
Now, by associativity and commutatibity property of a ring, we have,
a(bx)=0
And
b(ax)=0
If, $0\ne bx\in R$, then we can say by definition of zezro divisor that a is zero divisor. Also, on the other hand, if we have bx=0, then as the value of $x\ne 0$, by our assumption, get again by using the definition of zero divisor that, b is a zero divisor
Hence, it can be a concluded that either a or b is a zero-divisor