Regular Definition and 269 Threads

Does anyone know if this regular expression can be simplified? (a*bc*bc*|c*)*b I tried (a|b|c)*b, but it's not correct.

I was reading about what would happen if an Anti-Matter star and Matter star collided. What I read says the collision would make enough gamma rays to sterilize and entire eighth of a galaxy of life. Yet, I thought about something, when the two collide, their surfaces would touch first. (Duh) So...

If possible, could anyone tell me if the clousure of every open connected set always has a regular boundary ? thanks in advance.

How do I approach this problem? give a regular expression for a set containing strings consisting of 0s and 1s where numbr of zeroes is odd... thanks ps: I have tried it with Kleene's theorem, but there is so many possibilities that i get lost

Can anyone help me with this question please... Five points form the vertices of a regular pentagon. What is the shortest distance such that we can go from any of those five points to each of the four remaining points using the minimum amount of lines to join the points? What about 6...

The higher levels of Sugar in chocolate milk, will this mean that it keeps longer? Also the eternal Chocolate vs no chocolate issue? Should we make value judgements based on the consumption of chocolate even in less obvious forms? :smile:

I have seen two different definitions of "completely regular" (one in my class and online, and the other in my textbook). I am having trouble seeing how these definitions are equivalent. A space S is said to be completely regular if for every closed subset C of S and every point x in S-C...

Hi All, I'm looking for the conformal mapping (using complex functions) that maps the unit circle (or the upper half plane) into a REGULAR polygon with n vertices. I know the Schwarz-Christoffel transformation for an ARBITRARY polygon, but that doesn't help me because the expression is way...

Show that the only regular figures that fills the plane are the triangle, the square and the hexagon.

I heard one of the problems with quantum computers is there is not a certin output for each input, meaning there is some randomness in their computations. Can this randomness some how be reduced until it becomes negligible? My question is basicly can a quantum computer perform most of the...

What are the distinguishing characteristics of Fascism that make it different from any other Dictatorship out there? I mean, I hear "Hitler and Moussolini were Fascist", but being that nearly everything I know about those two comes from the American Public School system and the History Channel...

Hi, I have a question regarding group theory. For the cyclic group C2 with elements e and a, what are the matrices of the regular representation? How do you find this? How would I reduce this representation into irreducible representation? Lastly, how do I find a matrix which brings the...

I've been intrigued by regular polyhedra for years, and have oft tinkered with them. Can someone provide the "textbook definition" of a regular polyhedron?

My dad just bought a car and he decided to use a premium gasoline instead. The car uses regular at the moment, if premium is mixed into it would it somehow ruin the engine? long term wise is this a bad thing?

Hey ppl, Could anyone help me with this: what is the ratio of the areas of the circumscribed and inscribed circles of a regular hexagon? how do I go about working it out from first principles? Cheers, joe

How do i show that a group of symmetries of a regular quindecagon has order |G| = 30 ? And how do i describe the elements of G and classify them by their order? Thanks

Archived thread "Volumes of Regular Icosahedron and Regular Tetrahedron" Hi, The above-referenced thread is at this url address: https://www.physicsforums.com/archive/t-3876 I have something to add, having worked with this structure, in a bit of a different way, however, than is spoken...

A friend at work asked me to calculate the central angle of a regular dodecahedron. I think he was trying to stump me. :smile: Just to be sure we are talking the same thing, he was referring to the angle between any two radii drawn from a vertex of the dodecahedron to the center. At any...

Please teach me. Is one Regular Icosahedron equal to twenty Regular Tetrahedrons ? If the edgelength of both Regular Polyhedras is 1, What would be their volumes ? Can we prove (or disprove) the equation below ? volume of Regular Icosahedron = 20 * volume of Regular Tetrahedron...