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I Love Math Ringer T I Love Math, where the heart is actually a cardioid on polar coordinates. r=1-sin theta. For the math nerd or teacher. $17.95 Size:  Size Chart Small Medium Large X-Large 2X-Large (+$3.00) Color: Black/White Red/White Navy/White Qty:    AVAILABILITY: Product Number: 28308564 Product Information Fit: Standard Not too tight, not too loose. Fabric Thickness: The Ringer T has made a fashion comeback, and ours is a popular favorite. This classic style is sure to impress even the most discerning t-shirt connoisseur with an eye for retro-coolness. Great for relaxing in comfort year-round. 5.5 oz 100% preshrunk cotton Double-needle hemmed trim Contrast ringer neck and sleeves