The term "Delta nu sigma" (\(\Delta \nu \Sigma\)) does not directly relate to a standard notation in polymer chemistry or physics as it pertains to polymer bonding. Polymer bonding generally involves covalent bonds forming the polymer backbone and various intermolecular forces such as hydrogen bonding, van der Waals forces, and ionic interactions that contribute to the polymer's physical properties. In polymer science, the focus is often on the degree of polymerization, molecular weight, and the nature of the monomers and their arrangement (tacticity, for example). It's possible that "Delta nu sigma" could be a component of a specific, less-commonly referenced concept or a misinterpretation of symbols used to describe changes in vibrational states (\(\Delta \nu\)) or stress (\(\sigma\)) in materials science contexts. Without additional context, it's challenging to provide a precise explanation for this term in relation to polymer bonding.

To slip 3 purlwise with yarn in back (wyib), first ensure your working yarn is held to the back of the work. Next, insert the right knitting needle into the next 3 stitches on the left needle as if to purl, but instead of wrapping the yarn and pulling it through, you simply slide the stitches from the left needle to the right needle without knitting them. This technique is used to create specific textured patterns or to shape your knitting without decreasing the stitch count. It's crucial to keep the yarn tension even to avoid pulling the stitches too tight or leaving them too loose.

To slip 3 purlwise with yarn in back (wyib), first ensure your working yarn is held to the back of the work. Next, insert the right knitting needle into the next 3 stitches on the left needle as if to purl, but instead of wrapping the yarn and pulling it through, you simply slide the stitches from the left needle to the right needle without knitting them. This technique is used to create specific textured patterns or to shape your knitting without decreasing the stitch count. It's crucial to keep the yarn tension even to avoid pulling the stitches too tight or leaving them too loose.

Resin is not classified as a metal. Resin is a solid or semi-solid substance, typically exuded by plants, particularly coniferous trees, and is known for its aromatic properties. In modern industrial applications, resin often refers to synthetic polymers used in various manufacturing processes, such as epoxy resins for coatings and adhesives. These synthetic resins are derived from petrochemicals or natural sources and are characterized by their ability to harden upon curing. On the other hand, metals are elements or alloys with high electrical and thermal conductivity, malleability, and ductility. Metals are typically found in the Earth's crust and must be extracted through processes like smelting. While both resins and metals have significant industrial uses, they possess distinct physical and chemical properties, making them suitable for different applications. For instance, metals are commonly used in construction and electronics due to their strength and conductivity, whereas resins are preferred for their versatility and chemical resistance.