Using a gradation of openness in a (Chang fuzzy) I-topological space, we introduce degrees of compactness that we call α-fuzzy compactness (where α belongs to the unit interval), so extending the concept of compactness due to C. L. Chang. We obtain a Baire category theorem for α-locally compact spaces and construct a one-point α-fuzzy compactification of an I-topological space. 1. Introduction....

The quality of an aggregate in a concrete mixture is one the factors that affect concrete. Geographically, Payakumbuh City and District 50 cities are passed by several rivers where river's products used local community as building material. This research uses quantitative approach, method experiment. results this study found average compressive strength normal fc was 19.3 Mpa at age 14 days usi...

In this paper, we introduce the concepts of r-closure and r-interior defined by intuitionistic gradation of openness. We also introduce the concepts of r-gp-maps, weakly r-gp-maps, and obtain some characterizations in terms of r-closure and r-interior operators.