is the intersection of subgroups a subgroup of each subgroup Show that if two triangles built on parallel lines, with equal bases have the same perimeter only if they are congruent. Is it tax fraud for an individual to declare non-taxable revenue as taxable income? (US tax laws) Languages that we cannot (dis)prove to be Context-Free What defenses are there against being summoned by the Gate spell? Is it unprofessional to ask if a job posting on GlassDoor is real? Animated Series: Alien black spider robot crashes on Earth "You are your self first supporter", a more proper way to say it I’m planning on buying a laser printer but concerned about the life cycle of toner in the machine Theorems that impeded progress Mathematical cryptic clues How to format long polynomial? What does "Puller Prush Person" mean? If I cast Expeditious Retreat, can I Dash as a bonus action on the same turn? The Two and the One The use of multiple foreign keys on...