FT Digital Edition: our digitised print edition
Unlike subway tokens, these were not coin-shaped. The most common scheme was a
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Author(s): Cai-Fu Pan, Dong-Jie Wang, Wen-Lue Mao, Li-Xia Jia, Yan-Kun Dou, Jin-Li Cao, Xin-Fu He, Wen Yang
f(x1,x2)=x1⋅Swish(x2)=x1⋅(x2⋅σ(x2))
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