Blackboard bold
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Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, and the derived style of typeface used in printed mathematical t
Typewritten lecture notes by Gunning (1966), showing "blackboard bold" style R and C achieved by double-striking each letter with significant offset
A page from Loomis & Sternberg (1968), showing an early example of "blackboard bold" style R and C in a printed book
Blackboard bold on a blackboard
Lecture
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A lecture is an oral presentation intended to present information or teach people about a particular subject, for example by a university or college teacher. Lectures are used to convey critical infor
Blackboard bold
…Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, and the derived style of typeface used in printed mathematical texts. The style is most commonly used to represent the number sets N (natural numbers…
Lecture at the Australian Defence Force Academy
A lecture at the University of Bologna in Italy in the mid-fourteenth century. The lecturer reads from a text on the lectern while students in the back sleep.
Barbara McClintock delivers her Nobel lecture
Golan Levin lecturing using a projected slide