Star baby quilt top - with a slight problem

A few weeks ago (actually, a few weeks before Thanksgiving) I was feeling like I had done a lot of apparel sewing this year and not enough quilting.  I have fabric and pattern all ready to go for two or three lap to bed size quilts, but I was also feeling kind of overwhelmed with work and job-searching (I'm expecting to graduate in May), so I pulled out a Simply Color charm pack I've had sitting around for a while and the leftover grey background fabric from my Half Moon Modern Half-Square Triangle quilt and went to town with this free Moda pattern.

It took two evenings to piece the top.  I didn't trim my HST units or pin any seams until I had all of the rows sewn together.  It was quick and easy and fun, and really satisfying to get it done quickly, and I think it looks great - but it is decidedly not flat, which I'm feeling pretty okay about.  I think it will quilt out just fine.  I am not stressing out about this little baby quilt.

The problem came at the end of the second night of piecing, when I pulled out the fabric I had bought for backing and binding when I bought the charm pack.  I only have one yard of the backing fabric.  Lately I've been in a groove of making baby quilts about 40" by 50" and so I assumed that I would have 1.5 yards for the backing, but I don't.  I don't have enough binding fabric to do anything but bind it (only 1/3 yard!) and I don't have any of the grey fabric left over.  I think what I'm going to do is trim 4" of of the two wider borders on the top and then piece that fabric into the back along with a few leftover charm squares that didn't get used in the top.

I'm not really feeling inspired to finish this quilt right now, but at least I have a plan for how to finish it.  I don't like to have long-term hibernating UFOs, but I also don't know of any babies who will be needing a quilt from me any time soon, so I think I'm going to piece the back and then fold it all up until I feel like finishing it.

Being a mathematician improves my knitting

I am a mathematician.  The fact that I am a mathematician shapes the way I think, and slips out when I tell my mom that she doesn't need to worry about my apartment flooding because it's at a local maximum, or how I have a special appreciation for the non-simply-connected geological features at Arches National Park, or in my knitting.  Lately I've been noticing how my mathematical ways of thinking are helping me knit this little cable cardigan (Trellis from Knitty) for my nephew.

Modular Arithmetic: This particular cardigan has an 18-row cable pattern that repeats several times beginning with row 9 of the sweater body, while at the same time you knit a buttonhole every tenth row beginning in row 5.  So I know that I need to put a buttonhole in row 5, 15, 25, 35, and 45.  I want to start counting my rows with row 1 of the CABLE PATTERN, so using the new numbering system for rows, I'll be putting buttonholes in row 7 (this is the second buttonhole), 17, 27, and 37.  Then using modular arithmetic (also known as clock arithmetic) I reduce those modulo 18 and work buttonholes in rows 7, 17, 9, and 1 of the CABLE PATTERN. For me, this is much easier than trying to keep track of one count for the cable pattern and another for the buttonholes - instead, I just track everything in terms of the cable pattern.

Symmetry:  If you look closely at my photos in this post and compare them to the photos in the pattern, you'll notice that I changed some of the cable crossings.  Many mathematicians care a lot about symmetry (non-mathematicians care about this too, of course, but we're trained to notice it wherever we can).  This is a case where I think the pattern-writer was wrong.  If you imagine a vertical line going down the middle of the back of the sweater, in the center seed stitch column, and think of reflecting one side of the sweater across that line, you would get the other side of the sweater.  This is called a reflectional symmetry, and it makes for a much more pleasing image than what is written in the original pattern, with all of the large fancy cables twisting to the "right" and all of the little cables twisting "left."  I fixed this so that the two large fancy cables on each of the front and back twist toward the center, and each of the little cables twists toward the large fancy cable it frames.  

Braids:   This one doesn't really improve my knitting as much as add to my enjoyment.  My research is in knot theory, which is closely related to the study of mathematical braids. Every knitted cable is a braid; in this sweater, each of the fancy cables is a two-strand braid, and each of the little cables is a four-strand braid.  Referring back to symmetry for a moment, the mirror image of a braid is its inverse, so in this sweater we see braids paired with their inverses.  It makes me so happy when my work shows up in other areas of my life!  I'm so glad I'm a mathematician - if I wasn't, I wouldn't be able to properly appreciate this little sweater!