Hardness is a measure of resistance to plastic deformation in materials science. Different materials have different levels of hardness, ranging from hard metals like titanium and beryllium to soft metals like sodium and wood. Hardness can be measured in various ways, such as scratch hardness, indentation hardness, and rebound hardness. It is dependent on many factors, including ductility, elastic stiffness, plasticity, strength, and toughness. Examples of hard matter include ceramics, concrete, certain metals, and superhard materials.
Carnegie Mellon University
Spring 2023
This course provides an initial dive into complexity theory, exploring computations bound by resources like time, space, and energy. Emphasis is placed on low complexity classes.
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