Front matter guideline:
Sample frontmatter
'''
---
layout: post
title: "Chapter 3: Vector spaces and Subspaces"
crawlertitle: "All about vectors"
summary: "Just a sumary about vectors"
date: 2020-09-29
categories: ['Linear Algebra']
tags: ['linear algebra', vector]
author: <your name>
bg: "mountain.jpg"
---
'''