string theoryF-theoryD-branesWe discuss the field theory of 3-brane probes in F-theory compactifications in two configurations, generalizing the work of Sen and of Banks, Douglas and Seiberg. One configuration involves several parallel 3-brane probes in F-theory compactified on T/Z, while the...
Small Instantons in String Theory A long-standing puzzle about the heterotic string has been what happens when an instanton shrinks to zero size. It is argued here that the answer at the qu... E Witten 被引量: 1783发表: 1995年 New N=2 Superconformal Field Theories in Four Dimensions New...
40. Do you know about Bubble Sorting? Bubble is a very basic sorting algorithm in Computer Programming. It is also known as a sinking sort. Here, elements located beside each other in a data structure (such as an array) are continuously compared until the order of the list is corrected. ...
We’ve already told you about the nil and false constructs available in Ruby. Although both of them evaluates as false when used inside expressions, there’re subtle differences between them. For one, nil can’t be a value but false can. Usually, Ruby programs return nil when there is no...
Superposition is one of those things we absolutely cannot escape. Although there are plenty of disagreements at the fringe of quantum theory (as there ever should be), the idea of superposition is not one of them. It’s bedrock. It would be like competing climatologists arguing about whether ...
You need to make sure you are focusing on design rather than theory or model architecture. Make sure to talk about model inference and how improving it will increase the overall revenues. Also, give an overview of why you selected a certain methodology over the other. Learn more about bui...
General questions TopicRepliesViewsActivity About the General questions category 1234March 14, 2024 Best device for app 487March 26, 2025 Riffs 2 string 2129March 24, 2025 Justing Guitar APP when to start practice routine? During a module or at the end?
Everyone was talking about it. Now what happened was this—and I’m going to piss off a lot of string theorists by speaking so broadly, but here goes—CERN came on-line. They found the Higgs-Boson and other things, but many of the experiments were testing string theory, and they did ...
Given a graphGand a vertexuofG, the problem of determining whether there exists a cycle of lengthkstarting atuis a common one in graph theory. Mathematica provides a functionFindcyclefor this task, though I am not sure which algorithm it employs—perhaps depth-first search (DFS)? Maple, on...
However, recent theories in physics,including one called string theory,are now telling us there could becountless other universesbuilt on different types of particles,with different properties,obeying different laws. 然而,物理学最近的理论显示,包括弦理论,告诉我们世界上可能会有数不完的其他宇宙由不同于...