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  2. English grammar - Wikipedia

    en.wikipedia.org/wiki/English_grammar

    Apart from what are called the simple present (write, writes) and simple past (wrote), there are also continuous (progressive) forms (am/is/are/was/were writing), perfect forms (have/has/had written, and the perfect continuous have/has/had been writing), future forms (will write, will be writing, will have written, will have been writing), and ...

  3. Present continuous - Wikipedia

    en.wikipedia.org/wiki/Present_continuous

    The present continuous is formed by the present tense form of be and the present participle (-ing form) of the verb. [3] [4] For example, you would write the verb work in the present continuous form by adding the -ing suffix to the verb and placing a present tense form of be (am, are, is) in front of it: [3] I am working. You are working. She ...

  4. Simple present - Wikipedia

    en.wikipedia.org/wiki/Simple_present

    The simple present, present simple or present indefinite is one of the verb forms associated with the present tense in modern English. It is commonly referred to as a tense, although it also encodes certain information about aspect in addition to the present time. The simple present is the most commonly used verb form in English, accounting for ...

  5. Markov chain - Wikipedia

    en.wikipedia.org/wiki/Markov_chain

    In other words, conditional on the present state of the system, its future and past states are independent. A Markov chain is a type of Markov process that has either a discrete state space or a discrete index set (often representing time), but the precise definition of a Markov chain varies. [ 6 ]

  6. Biological system - Wikipedia

    en.wikipedia.org/wiki/Biological_system

    This idea was already present in Antiquity (Galen, Aristotle), but the application of the term "system" is more recent. For example, the nervous system was named by Monro (1783), but Rufus of Ephesus (c. 90–120), clearly viewed for the first time the brain, spinal cord, and craniospinal nerves as an anatomical unit, although he wrote little ...

  7. Logistic map - Wikipedia

    en.wikipedia.org/wiki/Logistic_map

    This sequence takes a particularly simple form for prime k: 2 ⋅ ⁠ 2 k − 1 − 1 / k ⁠. For example: 2 ⋅ ⁠ 2 13 − 1 − 1 / 13 ⁠ = 630 is the number of cycles of length 13. Since this case of the logistic map is chaotic for almost all initial conditions, all of these finite-length cycles are unstable.