Algebraic Christmas
H/t David Rousset
1 comment:
MikeD
said...
http://25.media.tumblr.com/tumblr_lna2kzx2sL1ql1zc8o1_400.jpg
2:16 PM
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http://25.media.tumblr.com/tumblr_lna2kzx2sL1ql1zc8o1_400.jpg
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