# Equality of Monomials of Polynomial Ring in Multiple Variables

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## Theorem

Let $R$ be a commutative ring with unity.

Let $I$ be a set.

Let $R \sqbrk {\sequence {x_i}_{i \mathop \in I} }$ be a polynomial ring in $I$ variables $\sequence {x_i}_{i \mathop \in I}$ over $R$.

Let $a, b : I \to \N$ be distinct mappings with finite support.

Then the monomials $\ds \prod_{i \mathop \in I} X_i^{a_i}$ and $\ds \prod_{i \mathop \in I} X_i^{b_i}$ are distinct, where:

- $X_i^k$ denotes the $k$th power of $X_i$
- $\prod$ denotes product with finite support

## Proof

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