- 变换群 biànhuànqún transformation group(mathematics) a group whose elements are transformations of a given set and whose group operation is the composition of transformations
- 射影变换 shèyǐngbiànhuàn projective transformationa transformation in projective geometry that maps lines to lines
- 积分变换 jīfēnbiànhuàn integral transformintegral transform in mathematics
- 阻抗变换器 zǔkàngbiànhuànqì impedance converteran electrical device that transforms the impedance of a circuit
- 变换设备 biànhuànshèbèi converterconverter; conversion device
- 傅立叶变换 fùlìyèbiànhuàn Fourier transformA mathematical process that transforms a function of time into a function of frequency