- Darryl McCray (born 1953), better known by his tagging name Cornbread, is an American graffiti writer from Philadelphia. He is widely considered the world’s first modern graffiti artist. McCray was raised in Brewerytown, a neighborhood of North Philadelphia. During the late 1960s, he and a group of friends started doing graffiti in Philadelphia, by writing their monikers on walls across the city. Independently to Philadelphia, the graffiti movement was evolving in New York City and blossomed into the modern graffiti movement, which reached its peak in the U.S. in the late 1970s and early 1980s, and then spread to Europe. McCray later worked with the Philadelphia’s Anti-Graffiti Network and Mural Arts Program to help combat the spread of graffiti in the city. He is currently a public speaker and a youth advocate.
- Universal quantification (Wikipedia)
In mathematical logic, a universal quantification is a type of quantifier, a logical constant which is interpreted as “given any”, “for all”, or “for any”. It expresses that a predicate can be satisfied by every member of a domain of discourse. In other words, it is the predication of a property or relation to every member of the domain. It asserts that a predicate within the scope of a universal quantifier is true of every value of a predicate variable.