What is entailment? Entailment is a concept that refers to a specific kind of relationship between two sentences. More specifically, entailment means that if one sentence is true, then another sentence would also have to be true: the second sentence would be entailed by the first sentence. Another way to prove entailment between two sentences is to demonstrate that if the one sentence is false, then the other sentence must also be false. Entailment is closely related to the concept of logical consequence. Within logic, the idea that if A is true, then B must be true too is nothing other than a form of entailment. Usage and rules
The topic is being increasingly debated as children get smartphones at an ever younger age. On average, children are getting their first smartphones around age 10, according to the research firm Influence Central, down from age 12 in 2012. For some children, smartphone ownership starts even sooner â including second graders as young as 7, according to internet safety experts.
Most American teenagers get their first cell phone in middle school, at age 12 or 13: 23% of teens got their first cell phone at age 12 and another 23% got their first phone at age 13. About 20% of teens have their first phone by the time they enter middle school (age 11 or under for first cell phone owned).eens 12 to 15 years old are the primary recipients of limits around the times of day they may use their cell phone. Some 60% of parents of 12-to-15 year-olds report limiting the times of day when their teenâs phone may be used, as do 39% of parents of 16-17 year-olds.