[76] 外積ベクトル 解説 定義と初歩的性質（四面体の体積、成分表示など）

Contents: Thanks for watching. This video is for introducing cross product of two vectors in 3 dimensions. Its definition is so easy that everyone can learn, but only few people know what it is, which I don't know why, maybe because of curriculum. Anyways, its functionality is beyond the description and there is no way you don't use this technique. 動画の内容：知る人ぞ知る外積ベクトルについての解説動画です。もちろんカリキュラム外ではありますが、知っておけば得すること満載です。定義は単純で応用範囲の広いことこの上ない代物ですのでこの機会にぜひ家庭に一台どうぞ。 -------------------------------------------------------------------------------- 主に数学に関することを動画にしています。みんなで面白いことをあーだこーだ言えたらいいなと。 動画に関するアドバイス（声量・ライト・ペン・板書など）や動画にしてほしいことなど何でも受け付けております。むしろください。 連絡等はこちらに→maths.toshi@gmail.com Thanks a ton for visiting here and reading this. Please subscribe this channel and give this video a like if you like it. I usually make videos about mathematics, but any kinds of topics which I find interesting and attractive. All I want to do is just discuss and talk about them, and communicate with people who are into maths, after all. I am afraid to say that I basically speak in Japanese in my videos; however, I am going to try and write things down in the way everyone can comprehend what they are, not without mathematics literacy at least :-). I would appreciate if you gave me any kind of advice ranging from the topics you would like me to bring about to the volume, my handwriting, and the lighting in my videos. Please do not hesitate to leave any comments for this channel growth, and help me to enrich this channel.