REL — a logic for relative evidential support

A formal logic—REL for Relative Evidential Support is proposed based on the following ideas: 1.1. Arguments are represented directly and are taken as the terms for REL. By arguments we mean the relationships between two judgments expressing that one supports or refutes the other, ie, evidential supports;2.2. Comparisons between arguments are used as carriers for their relative strengths. By comparisons we mean relationships between two arguments with respect to their strengths.3.3. Uncertainty reasoning is viewed as a process of three phases of: ◦evidence structure construction;◦evidence accumulation;◦decision-making.