The first step in tabulating the noncomposite knots with n crossings is the tabulation of the nonsingular plane projections of such knots, where two (piecewise linear) projections are regarded as equivalent, or in the same class, if they agree up to homeomorphism of the extended plane, i.e., the two-sphere.
Ang unang hakbang sa tabulating ang noncomposite knots sa n crossings ay ang hanay ng nonsingular eroplano projections ng knots, na kung saan ang dalawang (piecewise sa guhit) projections ay regarded bilang katumbas, o sa parehong class, kung sila ay sumang-ayon hanggang sa homeomorphism ng pinalawig eroplano, ibig sabihin, ang dalawang-abot.