The simplest invariant is S = (abc) (abd) (acd) (bcd) cf degree 4, which for the canonical form of Hesse is m(1 -m 3); its vanishing indicates that the form is expressible as a sum of three cubes.
Motivation Wallboard systems can provide further motivation for agents by being able to import and display information from sources other than the ACD system.
Allergic contact dermatitis (ACD) results when repeated exposure to an allergen (an allergy-causing substance) triggers an immune response that inflames the skin.
Fewer than 30, however, are responsible for the majority of ACD cases.
Moreover, patch testing works only with ACD, though it is considered an essential step in ruling out ICD.
