archive vs The Math Trainer

It's arXiv preprint search & PDF viewer app. All features are completely free to use. arXiv.org e-Print archive https://arxiv.org/ URL scheme: preprint:// Note: - This app uses arXiv APIs. - This app is run by an individual and has nothing to do with arXiv. Thank you to arXiv for use of its open access interoperability. --- * arXiv arXiv (pronounced "archive"—the X represents the Greek letter chi [χ]) is an open-access repository of electronic preprints and postprints (known as e-prints) approved for posting after moderation, but not peer review. It consists of scientific papers in the fields of mathematics, physics, astronomy, electrical engineering, computer science, quantitative biology, statistics, mathematical finance and economics, which can be accessed online. In many fields of mathematics and physics, almost all scientific papers are self-archived on the arXiv repository before publication in a peer-reviewed journal. Some publishers also grant permission for authors to archive the peer-reviewed postprint. Begun on August 14, 1991, arXiv.org passed the half-million-article milestone on October 3, 2008, and had hit a million by the end of 2014. As of April 2021, the submission rate is about 16,000 articles per month. Quoted from: https://en.wikipedia.org/wiki/ArXiv

The Personal Math Trainer With this app, you can train your mental math skills (addition, subtraction, multiplication, division and mix) every day, turning it into a habit. The app is designed to provide only the types of operations needed for more complex everyday calculations. You have two minutes to get as many correct answers as possible — but be careful, mistakes will cost you points. You can track your progress daily with a calendar displaying the last few months. Additionally, you can view graphs to monitor your daily improvement in each fundamental math operation. This app is highly useful for children starting out with math, but also for adults who want to stay sharp with mental calculations.