Quotes About Invariant

You can put any element into a collection with a raw type, easily corrupting the collection's type invariant (as demonstrated by the unsafeAdd method on page 119); you can't put any ele- ment (other than null) into a Collection>.

arrays are covariant. This scary-sounding word means simply that if Sub is a subtype of Super, then the array type Sub[] is a subtype of the array type Super[]. Generics, by contrast, are invariant: for any two distinct types Type1 and Type2, List is neither a subtype nor a supertype of List. You might think this means that generics are deficient, but arguably it is arrays that are deficient.

It is the contrast between the constant change and innovation of the modern world and the attempt to structure at least some parts of social life within it as unchanging and invariant, that makes the 'invention of tradition' so interesting for historians of the past two centuries.

Variables in functional languages do not vary.

La sensación de que el yo es permanente se deriva de la existencia de patrones coherentes que son recurrentes y de gran duración temporal. La recurrencia, predictibilidad y coherencia temporal de estos patrones se interpreta como evidencia de que existe un yo fijo y permanente, cuando, en realidad, solamente se trata de un proceso con ciertas características invariantes pero nunca con una existencia concreta e inamovible.

What better example than the World Cup is there of the fact that individual people are irrelevant while impersonal structures are invariant?

But, while bidirectional associations between ENTITIES may be hard to maintain, bidirectional associations between two VALUE OBJECTS just make no sense. Without identity, it is meaningless to say that an object points back to the same VALUE OBJECT that points to it. The most you could say is that it points to an object that is equal to the one pointing to it, but you would have to enforce that invariant somewhere.

But studies of sensory gating show that it is never invariant . . . in anyone. Gating parameters tend to move across a spectrum in all people (and to be variant across populations as well).

Fundamental to the conceptual framework of the theory is that, despite these completely different physical designs, both kinds of networks are constrained by the same three postulates: they are space filling, have invariant terminal units, and minimize the energy needed to pump fluid through the system.

Spinoza had argued that God, synonymous with nature, was immutable and eternal, leaving no room for chance. Agreeing with Spinoza, Einstein sought the invariant rules governing nature's mechanisms. He was absolutely determined to prove that the world was absolutely determined.