Let be subspaces, then, if and only if two conditions hold. One is that. What is the other condition?

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Let<br><img src='https://www.fatskills.com/images2/GradExams/F7E1667E-1B04-46B9-AB3C-8E30845CA5E7.png' height='18' width='89'/> be subspaces, then<br><img src='https://www.fatskills.com/images2/GradExams/97EBAF7D-F9CF-4E19-87FC-DDC2968D6C29.png' height='17' width='107'/>, if and only if two conditions hold. One is that<br><img src='https://www.fatskills.com/images2/GradExams/F23D2821-0DA2-4B0E-BEF8-6B6CCAC3BF66.png' height='17' width='106'/>. What is the other condition?