Can tensor calculus be learned online through video lectures? Are there any websites that offer this service?

 Yes, tensor calculus can be learned online through video lectures. There are several reputable websites and platforms that offer free or paid courses on tensor calculus, often accompanied by video lectures, written material, and exercises. Here are some good options for learning tensor calculus online: ### 1. **YouTube**    - Many professors and educators post free video lectures on YouTube covering tensor calculus. These can range from beginner-level introductions to more advanced topics.    - **Search terms** like "tensor calculus lecture" or "Introduction to tensor calculus" will yield many results. ### 2. **MIT OpenCourseWare (OCW)**    - MIT offers free access to a variety of lecture courses, including those that cover tensor calculus as part of higher-level physics and mathematics courses.    - **Course Example**: "General Relativity" and "Classical Mechanics" (both of which involve tensor calculus).    - Website: [MIT OpenCo...

Which is best online earning opportunity among Chegg and Photomath for a mathematics professional?

 Both Chegg and Photomath offer unique opportunities for mathematics professionals but cater to different preferences and skills. Here's a comparison to help you decide:


### Chegg:

- **Type of Work**: Provides tutoring services, where you can answer student questions or solve problems from various subjects, including math.

- **Flexibility**: Offers flexible hours, allowing tutors to work as much or as little as they want.

- **Earnings**: Tutors are paid per question answered, and the payment may vary based on the question's complexity and the tutor's expertise.

- **Audience**: Primarily high school and college students seeking help in various subjects.


### Photomath:

- **Type of Work**: Focuses on problem-solving, where you explain solutions to mathematical problems that users take pictures of.

- **Earnings**: Opportunities primarily come from contributing to the app's content or providing detailed solutions, which may not be as directly monetized as Chegg.

- **User Engagement**: Engages users through a mobile app, which may involve less interactive tutoring compared to Chegg.


### Conclusion:

- If you prefer direct interaction and teaching with potentially higher earnings, **Chegg** might be the better choice.

- If you enjoy problem-solving and providing solutions in a more automated format, consider **Photomath**.


Ultimately, your choice may depend on your preferred work style, earning goals, and engagement level with students.

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