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reversives, pairs of verbs which denote opposing processes, in which one is the reverse of the other. They are (or may be) performed by the same or similar subject(s) without requiring an object of the verbs, such as "rise" and "fall", "accelerate" and "decelerate", or "shrink" and "grow".
Sine and cosecant begin their period at (where is an integer), finish it at +, and then reverse themselves over + to +. Cosine and secant begin their period at 2 π k , {\displaystyle 2\pi k,} finish it at 2 π k + π . {\displaystyle 2\pi k+\pi .} and then reverse themselves over 2 π k + π {\displaystyle 2\pi k+\pi } to 2 π k + 2 π ...
In this usage, obverse means the front face of the object and reverse means the back face. The obverse of a coin is commonly called heads, because it often depicts the head of a prominent person, and the reverse tails. In numismatics, the abbreviation obv. is used for obverse, [1] while ℞, [1])([2] and rev. [3] are used for reverse.
Antithesis (pl.: antitheses; Greek for "setting opposite", from ἀντι-"against" and θέσις "placing") is used in writing or speech either as a proposition that contrasts with or reverses some previously mentioned proposition, or when two opposites are introduced together for contrasting effect.
In a vector space, the additive inverse −v (often called the opposite vector of v) has the same magnitude as v and but the opposite direction. [11] In modular arithmetic, the modular additive inverse of x is the number a such that a + x ≡ 0 (mod n) and always exists. For example, the inverse of 3 modulo 11 is 8, as 3 + 8 ≡ 0 (mod 11). [12]
In logic, an inverse is a type of conditional sentence which is an immediate inference made from another conditional sentence. More specifically, given a conditional sentence of the form , the inverse refers to the sentence .
Coin orientation (or coin alignment or variations of these) is the relation of the vertical orientation of the images on the obverse and reverse sides of coins to one another. The two basic relations are called medallic orientation and coin orientation.
Forward vs. inverse kinematics. In computer animation and robotics, inverse kinematics is the mathematical process of calculating the variable joint parameters needed to place the end of a kinematic chain, such as a robot manipulator or animation character's skeleton, in a given position and orientation relative to the start of the chain.