With the understanding that remainders are allowed, we can say that polynomial division is possible if the coefficient set is a __________ .

Question

BlackTom AI · Accepted Answer

A field is a set in which every nonzero element has a multiplicative inverse; this invertibility is the crucial property that makes polynomial long division always possible (with remainder).

1. Relevant knowledge points and concepts
- Polynomial division (division algorithm for polynomials) requires cancelling the leading term of the current dividend by multiplying the divisor by an appropriate scalar and monomial.
- To form that scalar you must divide the leading coefficient of the dividend by the leading coefficient of the divisor. That division requires the leading coefficient of the divisor to be invertible in the coefficient set.
- Definitions: a field is a commutative ring in which every nonzero element has a multiplicative inverse; a ring need not have inverses for all nonzero elements; a group has one operation and is not sufficient structure for polynomial arithmetic.

2. Complete reasoning process step by step
Let f(x) = a_n x^n + ... and g(x) = b_m x^m + ... with b_m ≠ 0 and n ≥ m. To eliminate the leading term a_n x^n we choose a term c x^{n-m} so that
c x^{n-m} · g(x) has leading term (c b_m) x^n.
We need c b_m = a_n, so c = a_n / b_m. For c to belong to the coefficient set, the element b_m must have a multiplicative inverse. Repeating this step down the degrees requires inverses for nonzero coefficients at each stage.

3. Intermediate calculation example
Example over integers Z: divide x by 2x. Leading coefficients are 1 and 2, so c = 1/2. But 1/2 ∉ Z, so division fails in Z. Over Q (a field) 1/2 exists and division succeeds.

4. Why the correct answer is correct
Because the division algorithm step requires dividing leading coefficients, the coefficient set must supply multiplicative inverses for all nonzero elements — exactly the field property.

5. Why other options are incorrect
- Factor: not a type of coefficient set; irrelevant.
- Ring: may lack multiplicative inverses for nonzero elements (e.g., Z), so polynomial division need not work.
- Group: only one binary operation (usually addition) and lacks the full ring/field structure needed for polynomial multiplication and division.

6. Conclusion
Therefore the coefficient set must be a field. This matches the provided correct answer: field.

With the understanding that remainders are allowed, we can say that polynomial division is possible if the coefficient set is a __________ .单项选择题

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