If you mean the symbol â, it means âcontains as an elementâ. The expression Aâx is equivalent to xâA, which means that x is an element of A and implies that A is a set. See Element (mathematics).
Concrete Floor Care 101. Concrete flooring is one of the most durable types of flooring you can install in your homeânot to mention it adds an interesting design element that is both contemporary and uncommon. Itâs also easy to maintain if you follow a few simple guidelines.
Polyurethane Wood Floors. The most popular wood floor surface is polyurethane. Polyurethane is the only floor finish that can be used just about anywhere. The three main types of polyurethane used on hardwood floors are; oil modified, water based and moisture cured. Oil modified polyurethane is often applied over oil based stains.