--- title: Decreasing & Increasing Sequences - Monotonic Sequences description: "Decreasing and increasing sequences: compare consecutive terms to see which way the list moves." url: https://astra-ai.co/videos/sequences/introduction-to-sequences/decreasing-and-increasing-sequences/ locale: en type: video-lesson keywords: - increasing sequences - decreasing sequences - monotonic - compare consecutive terms published: 2026-10-01T09:57:54.671Z updated: 2026-10-04T22:01:34.050Z alternates: it: https://astra-ai.co/it/videos/successioni/introduzione-successioni/successioni-decrescenti-crescenti/ pl: https://astra-ai.co/pl/videos/ciagi/wprowadzenie-do-ciagow/ciagi-malejace-i-rosnace/ fr: https://astra-ai.co/fr/videos/suites/introduction-aux-suites/suites-decroissantes-et-croissantes/ de: https://astra-ai.co/de/videos/folgen/einfuehrung-in-folgen/fallende-und-wachsende-folgen/ es: https://astra-ai.co/es/videos/sucesiones/introduccion-a-las-sucesiones/sucesiones-crecientes-y-decrecientes/ sl: https://astra-ai.co/sl/videos/zaporedja/uvod-v-zaporedja/padajoca-in-narascajoca-zaporedja/ hr: https://astra-ai.co/hr/videos/nizovi/uvod-u-nizove/padajuci-i-rastuci-nizovi/ pt: https://astra-ai.co/pt/videos/sequencias/introducao-as-matrizes/cordas-descendentes-e-ascendentes/ nl: https://astra-ai.co/nl/videos/reeksen/inleiding-tot-reeksen/dalende-en-stijgende-rijen/ fi: https://astra-ai.co/fi/videos/jonot/johdatus-jonoihin/vahenevat-ja-kasvavat-jonot/ da: https://astra-ai.co/da/videos/foelger/introduktion-til-foelger/aftagende-og-voksende-f-lger/ el: https://astra-ai.co/el/videos/akolouthies/eisagogi-stis-akolouthies/decreasing-and-increasing-sequences/ th: https://astra-ai.co/th/videos/lamdap/bot-15-botnam-lam-dap/botrian-036/ cs: https://astra-ai.co/cs/videos/sekvence/uvod-do-poli/klesajici-a-rostouci-posloupnosti/ bg: https://astra-ai.co/bg/videos/posledovatelnosti/vavedenie-v-masivite/nizhodyashti-i-vazhodyashti-struni/ id: https://astra-ai.co/id/videos/barisan/pengantar-barisan/barisan-menurun-dan-menaik/ no: https://astra-ai.co/no/videos/folger/introduksjon-til-f-lger/avtakende-og-voksende-tallf-lger/ ro: https://astra-ai.co/ro/videos/siruri/introducere-in-siruri/lectie-video-75d1eec7/ km: https://astra-ai.co/km/videos/sequences/chapter-71818979/lesson-75d1eec7/ sv: https://astra-ai.co/sv/videos/foljder/introduktion-till-talfoljder/avtagande-och-vaxande-talfoljder/ hu: https://astra-ai.co/hu/videos/sorozatok/bevezetes-a-sorozatokba/csokkeno-es-novekvo-sorozatok/ zh-TW: https://astra-ai.co/zh-TW/videos/sequences/chapter-71818979/lesson-75d1eec7/ lv: https://astra-ai.co/lv/videos/virknes/ievads-virknes/stunda-75d1eec7/ lt: https://astra-ai.co/lt/videos/sekos/ivadas-i-sekas/pamoka-75d1eec7/ uk: https://astra-ai.co/uk/videos/uk-topic-14/uk-chapter-15/uk-lesson-75d1eec7/ vi: https://astra-ai.co/vi/videos/vi-topic-14/vi-chapter-15/day-so-giam-va-tang/ sk: https://astra-ai.co/sk/videos/postupnosti/kapitola-011/lekcia-036/ sr: https://astra-ai.co/sr/videos/nizovi/poglavlje-011/lekcija-036/ tr: https://astra-ai.co/tr/videos/diziler/bolum-011/ders-036/ ms: https://astra-ai.co/ms/videos/jujukan/bab-15-matematik-asas/pelajaran-036/ my: https://astra-ai.co/my/videos/my-af25d53a/my-71818979/75d1eec7/ ms-BN: https://astra-ai.co/ms-BN/videos/jujukan/bab-matematik-11/pelajaran-75d1eec7/ lo: https://astra-ai.co/lo/videos/lo-af25d53a/lo-71818979/75d1eec7/ br: https://astra-ai.co/br/videos/sequencias/capitulo-matematica-015/video-matematica-036/ zh-HK: https://astra-ai.co/zh-HK/videos/shuxue-kecheng-014/shuxue-zhang-015/shuxue-kecheng-036/ mx: https://astra-ai.co/mx/videos/sucesiones/capitulo-11/leccion-36/ es-CL: https://astra-ai.co/es-CL/videos/sucesiones/capitulo-11/leccion-36/ en-PH: https://astra-ai.co/en-PH/videos/sequences/chapter-71818979/lesson-75d1eec7/ es-AR: https://astra-ai.co/es-AR/videos/sucesiones/capitulo-11/leccion-36/ en-IN: https://astra-ai.co/en-IN/videos/sequences/chapter-71818979/decreasing-and-increasing-sequences/ pt-TL: https://astra-ai.co/pt-TL/videos/sucessoes/capitulo-de-video-011/licao-de-video-036/ et: https://astra-ai.co/et/videos/jadad/sissejuhatus-jadadesse/kahanevad-ja-kasvavad-jadad/ es-PE: https://astra-ai.co/es-PE/videos/sucesiones/capitulo-video-71818979/leccion-de-video-75d1eec7/ ko: https://astra-ai.co/ko/videos/sequences-ko/11/036/ ja: https://astra-ai.co/ja/videos/sequences-ja/ja-chapter-11/036/ en: https://astra-ai.co/videos/sequences/introduction-to-sequences/decreasing-and-increasing-sequences/ --- # Decreasing and Increasing Sequences > Decreasing and increasing sequences are told apart by comparing consecutive terms. This lesson shows both tests. ## DECREASING AND INCREASING SEQUENCES In mathematics, a decreasing or increasing sequence is a basic concept representing a series of numbers or objects arranged in a specific order. Decreasing and increasing sequences deserve special attention as they play an important role in mathematics. ## DEFINITION - An **INCREASING SEQUENCE** (or non-decreasing sequence) is a sequence in which each subsequent term is greater than or equal to the previous term. This means the values sequentially increase or remain the same. (If each term is strictly greater than the previous, it's called strictly increasing). - A **DECREASING SEQUENCE** (or non-increasing sequence) is the opposite of an increasing sequence; each subsequent term is less than or equal to the previous term, meaning the values sequentially decrease or remain the same. (If each term is strictly less than the previous, it's called strictly decreasing). For easier understanding, imagine a series of natural numbers arranged in an increasing sequence, where each subsequent number is one unit greater than its predecessor. This example shows how values increase from one term to the next. Conversely, if this series of numbers were reversed, we would get a decreasing sequence, where each subsequent number is one unit smaller than its predecessor, illustrating a gradual decrease in values. ## CHARACTERISTICS AND PROPERTIES The characteristics of these sequences are important for understanding their structure and progression. In an increasing sequence, we observe continuous growth or stability of values, while in a decreasing sequence, we observe a continuous decline or stability. (Collectively, increasing and decreasing sequences are often referred to as **monotonic sequences**). ## IMPORTANCE IN MATHEMATICS Decreasing and increasing sequences are crucial in the analysis of functions, the study of series, and in solving problems involving sequences and series. Understanding these sequences allows for a better comprehension of the nature of mathematical functions and their applications. ## APPLICATIONS Increasing and decreasing sequences are found in various mathematical disciplines, including algebra and financial mathematics. They are used in determining the limits of functions, in studying the convergence of series, and in analyzing economic and financial models. ## CONCLUSION Decreasing and increasing sequences are fundamental concepts that enable a deeper understanding of mathematical principles and their application in practical problems. Their comprehension is essential for students and professionals involved in mathematical analyses and research. Exploring these sequences opens doors to discovering new mathematical truths and concepts.