diff --git a/zk/Law_of_Non-Contradiction.md b/zk/Law_of_Non_Contradiction.md similarity index 100% rename from zk/Law_of_Non-Contradiction.md rename to zk/Law_of_Non_Contradiction.md diff --git a/zk/Object_language_and_meta-language.md b/zk/Object_language_and_meta_language.md similarity index 100% rename from zk/Object_language_and_meta-language.md rename to zk/Object_language_and_meta_language.md diff --git a/zk/Truth-functional_connectives.md b/zk/Truth_functional_connectives.md similarity index 100% rename from zk/Truth-functional_connectives.md rename to zk/Truth_functional_connectives.md diff --git a/zk/Truth-tables.md b/zk/Truth_tables.md similarity index 100% rename from zk/Truth-tables.md rename to zk/Truth_tables.md diff --git a/zk/Truth-trees.md b/zk/Truth_trees.md similarity index 100% rename from zk/Truth-trees.md rename to zk/Truth_trees.md