My textbook *Groups, Matrices, and Vector Spaces - A Group Theoretic Approach to Linear Algebra* by James B. Carrell said that

[![enter image description here](https://i.stack.imgur.com/gXynj.png)](https://i.stack.imgur.com/gXynj.png)

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> $(m, n)=d$ if and only if there exist integers $r$ and $s$ such that $r m+s n=d$.
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We have $2\cdot3+4\cdot5=26$, but $(3,5)=1\neq 26$. Could you please explain if this paragraph is problematic?