# If <math>L\!</math> is a sign relation such that <math>\operatorname{Con}(L)</math> is a SER on <math>S = I,\!</math> then <math>[x]_L\!</math> is the SEC of <math>x\!</math> under <math>\operatorname{Con}(L).</math> | # If <math>L\!</math> is a sign relation such that <math>\operatorname{Con}(L)</math> is a SER on <math>S = I,\!</math> then <math>[x]_L\!</math> is the SEC of <math>x\!</math> under <math>\operatorname{Con}(L).</math> |