Message #2059

From: Eduard <>
Subject: Re: [MC4D] first IRP
Date: Tue, 10 Apr 2012 12:43:52 -0000

Hi Roice,

I played in IRP. When I reopen the saved File then I’m automatically in a hyperbolic view. I cannot change to the IRP view.

For all IRP (when not reopened) and for Skew Polyhedra it is possible to change to the hyperbolic view (both: Poincarré and Klein) with "Setting/Skew Polyhedra (IRP and 4D)/Show as skew/ false" and reverse.

The inverse is not possible: start with a hyperbolic puzzle then change to the IRP or Skew.
Normally there is no overlapping. The more recent IRP puzzles avoid redundancy with the hyperpolic puzzles.
This is not allways the case. Example:
Skew Polyhedra / {4,4|3} 9c F 0:0:1 is equivalent to
Euclidian / Klein / {4,4} 9c F 0:0:1.

For some cases the visibility in IRP is not as easy as in the hypebolic view.


— In, Roice Nelson <roice3@…> wrote:
> Yes, nicely done Ed :) The density of that one seems like it would be
> challenging to deal with.
> The IRPs are listed in this section of the MagicTile records
> page<>in
> the wiki. It might be nice to move them to their own page at some
> point, as that page feels pretty unwieldy. But in the meantime, at least
> there is a spot to record IRP solutions.
> seeya,
> Roice
> On Mon, Apr 9, 2012 at 5:13 PM, Melinda Green wrote:
> > Hey, congratulations, Ed!
> > I guess we need a new wiki hall-of-fame for IRP records. I’m just not
> > sure where it should go. Roice, what do you think?
> >
> > BTW, Roice and I are recently back from the prestigious Gathering for
> > Gardner conference where I gave a talk on IRPs. I was very nervous but
> > about half way in I hit my stride. I explained these little-known
> > objects and how they relate to the Platonic solids. Only at the end did
> > I show that these objects are also twisty puzzles, and that really wowed
> > the crowd. Hopefully we will pick up some more members interested in
> > these and all the other wonderful twisty puzzles we now support.
> >
> > -Melinda
> >
> > On 4/9/2012 2:28 PM, Eduard wrote:
> > > I have solved my first IRP.
> > > IRP {6,6} 4-Color E0.7:0:0 Baumann Eduard 04/08/12 107 twists
> > > Ed
> >