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Alhambra Valley-Carquinez Scenic Dr

Wednesday, November 12, 2014

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This loop goes up the gentle east side of Pig Farm Hill for a wonderful run through the beautiful Alhambra Valley to Pinole Valley. 1,305 more words

Contra Costa County

Smallest Subring of R that contains $S \cup \{a\}$

I need a bit of help with this question, I already have proven the first bit:

Let $R$ be an abelian and unital ring and let $S$ be a subrinrg of $R$ such that $1_R \in S$. 99 more words