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Printable Import-export Supports sync Plugin support Working offline Anki: AGPLv3 (personal computer, Android), proprietary Yes (except iOS) Yes Multiple Yes Yes Yes Video, LaTeX, HTML: Plugin [1] Yes Yes Yes Yes Brainscape: Proprietary: Yes Yes 2 Yes Yes Yes HTML, Markdown: Yes Yes Yes Yes Yes Cerego: Proprietary: Yes Yes Multiple Yes Yes Yes
OpenCards is a free spaced repetition flashcard program. The software is similar to SuperMemo, Anki or Mnemosyne. The flashcards are saved as PowerPoint presentation files and may include text, images, sounds and LaTeX equations. The learning states are saved in hidden meta-data files in the same directory as the flashcards files.
A sentence can be viewed as expressing a proposition, something that must be true or false. The restriction of having no free variables is needed to make sure that sentences can have concrete, fixed truth values : as the free variables of a (general) formula can range over several values, the truth value of such a formula may vary.
In this example, both sentences happen to have the common form () for some individual , in the first sentence the value of the variable x is "Socrates", and in the second sentence it is "Plato". Due to the ability to speak about non-logical individuals along with the original logical connectives, first-order logic includes propositional logic.
A flashcard or flash card is a card bearing information on both sides, usually intended to practice and/or aid memorization. It can be virtual (part of a flashcard software ) or physical. Typically, each flashcard bears a question or definition on one side and an answer or target term on the other.
Anki (US: / ˈ ɑː ŋ k i /, UK: / ˈ æ ŋ k i /; Japanese:) is a free and open-source flashcard program. It uses techniques from cognitive science such as active recall testing and spaced repetition to aid the user in memorization. [4] [5] The name comes from the Japanese word for "memorization" . [6]
In mathematical logic, algebraic logic is the reasoning obtained by manipulating equations with free variables.. What is now usually called classical algebraic logic focuses on the identification and algebraic description of models appropriate for the study of various logics (in the form of classes of algebras that constitute the algebraic semantics for these deductive systems) and connected ...
The formalism of universal algebra is much more restrictive; essentially it only allows first-order sentences that have the form of universally quantified equations between terms, e.g. x y (x + y = y + x). One consequence is that the choice of a signature is more significant in universal algebra than it is in model theory.