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• Identical expressions

• -sign(x - one) + sign(x + one) = zero
• minus sign(x minus 1) plus sign(x plus 1) equally 0
• minus sign(x minus one) plus sign(x plus one) equally zero
• -signx - 1 + signx + 1 = 0

• Similar expressions

• -sign(x - 1) + sign(x - 1) = 0
• -sign(x + 1) + sign(x + 1) = 0
• sign(x - 1) + sign(x + 1) = 0
• -sign(x - 1) - sign(x + 1) = 0