True or false

A consequence is monotonic if replacing the conclusion with another proposition might yield a weaker consequence or a non-consequence. 2. A type of consequence is transitive only if given a complex argument all the steps of which are consequences of that type, the argument from the initial basis propositions of the complex argument to the final conclusion is a consequence of that type. 3. Non-deductive consequence is transitive. 4 Valid deductions are fallible - in the sense that the conclusion may not follow with perfect evidentness from the initial premisses or may not be perfectly evident simply by virtue of following from the premisses, even if the initial premisses are perfectly evident truths. 3. Non-deductive arguments are open-ended (not self-contained), since they can have premisses that may be false. A Any argument with a necessary truth as conclusion is truth-preserving 5. No argument with a true conclusion and false premiss is valid. 6 Some logicians affirm that some (simply) truth-preserving arguments are necessary consequences