We call a positive number cologarithm **B** in a base **The** (a> 0, the1) and we indicate colog_{The} b the inverse logarithm of this number **B** in the base **The**.

We call a positive number cologarithm **B** in a base **The** (a> 0, the1) and we indicate colog_{The} b the inverse logarithm of this number **B** in the base **The**.