Direkter Beweisrechner
For all x∈Z, if 3|x and 5|x, then 15|x
Uninterested Unicorn
For all x∈Z, if 3|x and 5|x, then 15|x 2. If a is an odd integer, then a^2+3a +5 is odd.2.If a is an odd integer, then a^2+3a +5 is odd.A x (P(x) V Q(x))