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The image for this section (two circles, denoting sets C and D) has the sets labeled opposite from what the text describes - y_i should lie on circle D, x_i should like on circle C, as per the text: "x_{k+1} = P_C(P_D(x_K))" — Preceding unsigned comment added by 199.46.251.141 (talk) 21:37, 15 January 2020 (UTC)[reply]