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Uncertainty Theory Laboratory (UTLab), founded in 1998 by Professor Baoding Liu, is a research group devoted to exploring the mathematical foundation of uncertainty. UTLab members focus their research efforts on uncertainty theory, uncertain programming, uncertain process, uncertain calculus, uncertain differential equation, and uncertain logic. Primary sponsors of the research in UTLab include Tsinghua University, Ministry of Education, Ministry of Science and Technology, and National Natural Science Foundation of China.

Vol.1: Baoding Liu, Uncertainty Theory, 3rd ed., http://orsc.edu.cn/liu/ut.pdf.

Vol.2: Baoding Liu, Theory and Practice of Uncertain Programming, 2nd ed., http://orsc.edu.cn/liu/up.pdf.

Vol.3: Zhongfeng Qin and Xiang Li, Fuzzy Calculus for Finance, http://orsc.edu.cn/process/fc.pdf.

Vol.4: Xiang Li, Credibilistic Logic and Uncertain Logic, http://orsc.edu.cn/~xli/ulogic.pdf.

Vol.5: Xiaowei Chen, Fuzzy Differential Equations, http://orsc.edu.cn/~xwchen/fde.pdf.

Vol.6: Yuanguo Zhu, Fuzzy Control Theory, http://orsc.edu.cn/~ygzhu/fct.pdf.

不确定是绝对的，确定是相对的。Uncertainty is absolute, and certainty is relative.

世界既不是随机的也不是模糊的，但有时可以用概率度量，有时可以用可信性度量。The world is neither random nor fuzzy, but sometimes it can be quantified by probability, and sometimes by credibility.

概率论和可信性理论是并行互补的数学系统。Probability theory and credibility theory are parallel and complementary mathematical systems dealing with uncertainty.