In other words, a sentence is true according to M and μ {\displaystyle \mu } if and only if it is true according to M and every other variable assignment μ ′ {\displaystyle \mu '} .
換句話說，一個句子根據M及 μ {\displaystyle \mu } 為真，若且唯若這個句子根據M及其他的變數賦值 μ ′ {\displaystyle \mu '} 為真。