A membrane is the two-dimensional analog of a stretched string

Evidence

Networks of strings are a good segue between simple strings and membranes. If the network is connected in a certain way and gets dense enough, a membrane is the result. A membrane is the 2D analog of a ID string. — Eric J. Heller, Why You Hear What You Hear- An…, 1351

Categorization

• DEFINE: Defines a membrane as the 2D analog of a 1D string, tying the chapter back to central string theory.