Context: Death from laughter is a rare form of death, usually resulting from cardiac arrest or asphyxiation, caused by a fit of laughter. Instances of death by laughter have been recorded from the times of ancient Greece to the modern day.
 Question: can you have a heart attack from laughing Context: A partially ordered set is a bounded lattice if and only if every finite set of elements (including the empty set) has a join and a meet. For every element x of a poset it is trivially true (it is a vacuous truth) that ∀ a ∈ ∅ : x ≤ a (\displaystyle \forall a\in \varnothing :x\leq a) and ∀ a ∈ ∅ : a ≤ x (\displaystyle \forall a\in \varnothing :a\leq x) , and therefore every element of a poset is both an upper bound and a lower bound of the empty set. This implies that the join of an empty set is the least element ⋁ ∅ = 0 (\displaystyle \bigvee \varnothing =0) , and the meet of the empty set is the greatest element ⋀ ∅ = 1 (\displaystyle \bigwedge \varnothing =1) . This is consistent with the associativity and commutativity of meet and join: the join of a union of finite sets is equal to the join of the joins of the sets, and dually, the meet of a union of finite sets is equal to the meet of the meets of the sets, i.e., for finite subsets A and B of a poset L,
 Question: does the system of all subsets of a finite set under the operation subset of form a lattice Context: Letter jackets are almost never purchased before a student has earned a letter. In schools where only varsity letters are awarded this is usually the practice in a student's junior or senior year. Recently, however, many student athletes have been awarded letters during their sophomore and sometimes freshman year, leading to the need for a jacket much sooner. Still, the actual jacket isn't usually purchased until the sophomore year at least. In schools where junior varsity letters are awarded, the jacket may be purchased by junior varsity letter recipients, though the letter is placed just above the left pocket, leaving space for a future varsity letter.
 Question: can you get a letterman jacket as a freshman Context: Azazel's last appearance chronologically is in the second season finale ``All Hell Breaks Loose'', where he kidnaps Sam and the other young adults that he had infected. He visits Sam in a dream, and reveals that his ``special children'' must fight to the death to determine who will lead his army. Although Sam is the demon's favorite, the super-strong Jake Talley becomes the winner. As Dean sells his soul to another demon in exchange for Sam's resurrection, Azazel gives Jake the Colt and coerces him to travel to a cemetery in the middle of a giant devil's trap. Though Sam and Dean, along with other hunters, attempt to stop him, Jake uses the Colt as a key to unlock a mausoleum there. This action briefly opens a gateway to Hell, releasing Lilith and hundreds of other demons. With the devil's trap around the cemetery now broken, Azazel confronts the Winchesters and easily overpowers them. However, John's soul escapes through the Gate, and distracts Azazel long enough for Dean to shoot him dead with the Colt.
 Question: do sam and dean find their mother killer
Yes
No
Yes
Yes