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Critical surface
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Ross indexed the following pages under the keyword: "Critical surface".

 Previous | Next | Cards | Index | Cloud 1941
 Break surface Critical surface defined 0897 0898
 Break surface Critical surface if not related to essential variables Summary: "Step-function" is defined. An analytic formula given for one. If a function in a substitution is a step function of the variables, the corresponding variable in the solved equations is a step-function of the time. The effect in a field of a step-function is discussed, The essential conditions for a break are a cloud of dots, each of which has a number associated with it saying "change one of the step-functions to this new value" and not a surface as suggested on 898. 1003 1004
 Critical surface if not related to essential variablesNeutral point (of equilibrium - including 'cycle', 'region' etc.) examples Summary: The behaviour of break-surfaces. 1021 1022
 Critical surface if not related to essential variablesCritical surface interactions Summary: An example is given, in all detail, of a substitution with two step-functions. It confirms the theorum of 1021. The existence of "false neutral points" is noted.Neutral point (of equilibrium - including 'cycle', 'region' etc.) "false" 1027 1028
 Summary: Later we shall have to show how we can break down the minute rigidity of our dynamic systems, where the minutest change has to be put in and may lead to something profoundly different. Suggested way of doing it.Break surface no free edgeCritical surface has no free edge Summary: The V-surface of a step-function cannot have a free edge.Group (mathematical) finite continuous 1043 1044

 Previous | Next | Cards | Index | Cloud 1942
 Break surface further propertiesCritical surface if not related to essential variables Summary: A clarification of the concept of a "break-surface". Summary: The conditioned reflex is not clear yet.Reflex, conditioned and break-theory 1175 1176

 Previous | Next | Cards | Index | Cloud 1950
 Summary: Allbutt on a type of man.Essential variables sometimes not related to critical states Critical surface if not related to essential variablesPain patient insensitive to pain 2831 2832

 Previous | Next | Cards | Index | Cloud 1957
 Summary: Additive mechanisms in the brain. 5763, 5765.1, 5766.1, 5768Cortex as store Critical surface variation ofSignal in ultrastable system 5760 5761
 These images are reproduced courtesy of The Estate of W. Ross Ashby. Copyright 1972, 2008 © The Estate of W. Ross Ashby

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